October 13 and 14 2015Conference center De Werelt

Lunteren

Program and abstracts

39th Meeting of the section Atomic Molecular and Optical Physics (AMO)

39th Meeting of the sectionAtomic Molecular and Optical Physics (AMO)

Program and abstracts

Conference center De WereltLunteren

October 13 and 14 2015

Scientific Commitee:

Giel Berden • Kjeld Eikema • Martin van Exter • Ronald Hanson

Steven Hoekstra • Gert 't Hooft • Femius Koenderink

Servaas Kokkelmans • Bas .v.d. Meerakker • Herman Offerhaus (chair)

Dries van Oosten • Robert Spreeuw • Caspar van der Wal

Program Committee:

Martin van Exter • Dries van Oosten

This meeting is organized under the auspices of the NNV-section Atomic, Molecular and Optical Physics,

with financial support of the Dutch Science Foundation and the Foundation FOM.

Conference coordination:

Erna Gouwens (RU)

2

Tuesday 13 October 2015

10.00 Arrival, registration

10.40 Opening by the chair of the section AMO Herman Offerhaus

chair: Servaas Kokkelmans

10.45 I1 Klaus Mølmer (Physics and Astronomy, Aarhus University, Danmark)

“Exciting physics with highly excited atoms”

11.30 Short lectures: (Europa room)

O1 J.P. de Jong (Groningen University)

“Suppressing nuclear spin fluctuations around semiconductor electrons

via the interplay of optical coherent population trapping and dynamic

nuclear polarization”

O2 E.A. Dijck (van Swinderen Institute, University of Groningen)

“High precision spectroscopy of single 138BA+ ions

O3 M.L. Niu (Laserlab, VU University, Amsterdam)

“Precision QED tests in high vibrational states of H2”

O4 S.H.W. Wouters (Coherence and Quantum Technology, Eindhoven University

of Technology)

“Focused ion beam based on laser cooling and compression of a thermal

atomic beam”

12.30 Lunch

chair: Dries van Oosten

14.00 I2 Michal Lipson (Nanophotonics Group, Cornell University NY, USA)

“Extreme manipulation of light using nano photonics”

14.45 Short lectures: (Europa room)

O5 Rick Leijssen (FOM Institute AMOLF, Amsterdam)

“Nonlinear measurement of nanomechanical motion caused by extreme

optomechanical coupling”

O6 L. DeAngelis (FOM Institute AMOLF, Amsterdam)

“Phase singularities in random waves: Exploring optical statistics at

the nanoscale”

3

Tuesday 13 October 2015

15.15 Coffee/tea break (attach posters Afrika Room)

15.45 Short lectures: (Europa room)

O7 S. Greveling (Debey Institute for NanoMaterials, Utrecht University)

“Towards a photon gas in a chirped photonic crystal”

O8 M. Petruzella (COBRA Research Institute, Eindhoven University of Technology)

“Waveguide-integrated electrically-tunable quantum nodes”

O9 Freek Ruesink (FOM Institute AMOLF)

“Perturbing open cavities: Anomalous resonance frequency shifts in a hybrid

cavity-antenna system”

O10 I. Kabakova (FOM Institute AMOLF)

“Polarization evolution in vector fields near plasmonic nanowires”

16.45 Poster presentations “Afrika Room” (odd numbers)

18.00 Dinner (restaurant)

19.15 Poster presentations “Afrika Room” (even numbers)

21.15 chair: Gert ‘t Hooft

I3 Evening lecture

Frank Penning (Philips Lighting, Eindhoven)

“Lighting has changed”

POSTERS AND ORAL PRESENTATIONS

For oral contributions we have a limited time of 12 minutes per presentation (+ 3 minutes for discussion).

The posters can be placed during the coffee break.

Before 24.00 hr all posters must be removed.

(The room will be cleaned, so your poster could be damaged)

4

Wednesday 14 October 2015

08.00 Breakfast (restaurant, please remove the luggage from your room)

chair: Giel Berden

08.45 I4 Dave Parker (Molecular and Laser Physics, Institute for Molecules and

Materials, Radboud University)

“The magic of velocity map imaging”

09.30 Short talks (Europa room)

O11 Jolijn Onvlee (Molecular and Laser Physics, Institute for Molecules and

Materials, Radboud University)

“Imaging partial wave resonances in low-energy NO-He collisions”

O12 Alexander Stoffels (FELIX Laboratory, Institute for Molecules and Materials,

Radboud University)

“Infrared spectra of ionized primary alcohols at 4 K”

O13 Arghya Dey (FELIX Laboratory, Institute for Molecules and Materials,

Radboud University)

“Competitive hydrogen bond interaction: Conformer selective IR action

spectroscopy of Saligenin-water clusters”

O14 A. van der Poel (Laserlab, VU University, Amsterdam)

“Towards cold collision in a molecular synchrotron”

10.30 Coffee/tea break

chair: Femius Koenderink

11.00 I5 Artem Bakulin (Cavendish Laboratory, University of Cambridge,

United Kingdom)

“Using molecular vibrations to control electronic dynamics in organic materials

and devices”

11.45 Short talks (Europa room)

O15 Yuwei Jin (Molecular and Laser Physics, Institute for Molecules and Materials,

Radboud University)

“Vernier effect within a femtosecond optical parametric oscillator for

Broad-tunable, ultra-high repetition rate oscillation”

O16 Peter van der Slot (Laser Physics and Non-Linear Optics, MESA+,

University of Twente)

“A mirrorless photonic free-electron laser oscillator”

5

Wednesday 14 October 2015

O17 J. Barreaux (Laser Physics and Non-Linear Optics, MESA+, University of Twente)

“Narrow-band Zr-coated NI/SI multilayer Borrmann filter”

O18 L. Hou (Huygens-Kamerlingh Onnes Laboratory, Leiden University)

“Optical study of vapor nanobubbles formed around a continuously

laser-heated gold nanosphere in a liquid”

12.45 Lunch

chair: Herman Offerhaus

13.55 Presentation winner poster award

chair: Robert Spreeuw

O19 Vasco Tenner (Leiden University)

“Lasing characteristics of two dimensional surface plasmon in lasers in an

active meta-material”

O20 Michele Cotrufo (COBRA Research Institute, Eindhoven University of

Technology)

“K-space polarimetry measurements of the spin-dependent emission from

arrys of chiral plasmonic nanoantennas”

14.30 I6 Francesca Ferlaino (Physics-Innsbruck, University of Innsbruck, Austria)

“The fascination of Lanthanides for ultracold quantum matter”

15.20 Finish

6

Poster Program 2015P1 R.K. Altmann, (LaserLaB, VU University Amsterdam)

“Ramsey-Comb spectroscopy in the deep-ultraviolet spectral region.”P2 Lyubov Amitonova, (COPS, University of Twente)

“The rotational memory effect of amultimode fiber”P3 R. Amram, (Laser Physics and Nonlinear Optics, Mesa, University of Twente)

“Diagnostics of a photonic free-electron laser”P4 X. Bacalla, (LaserLaB, VU University Amsterdam)

“Electronic Spectroscopy of C6H, C6D, and 13C6H”P5 Daniël Bakker, (FELIX Laboratory, IMM, Radboud University)

“Towards a full understanding of gas phase far infrared action spectroscopy”P6 A. Bayerle, (van der Waals-Zeeman Institute, University of Amsterdam)

“Towards a quantum gas of RbSr ground-state molecules”P7 R. van der Beek, (LaserLaB, VU University Amsterdam)

“Towards an ultracold metastable helium interferometer for measuring α”P8 Rick van Bijnen, (Max-Planck Institut für Physik komplexer Systeme, Dresden)

“Quantum magnetism with Rydberg-dressed ground state atoms”P9 Phil Brown, (Molecular and Laser Physics, IMM, Radboud University)

“Breath sampling protocols for aroma analysis in food science”P10 C. Cheng, (LaserLaB, VU University Amsterdam)

“Precision measurements based on cold molecular ammonia”P11 C.C. Cheng, (van der Waals-Zeeman Institute, University of Amsterdam)

“Towards a perpetual atom laser”P12 Valeriy Chernyy, (Atomic Nano Structures, IMM, Radboud University)

“Towards time-resolved experiments probing of the electron-phonon coupling in clusters”

P13 Theo Cremers, (Molecular and Laser Physics, IMM, Radboud University)“The Nijmegen Zeeman decelerator: design and implementation”

P14 Hugo Doeleman, (FOM Institute AMOLF)“Large Purcell factors in hybrid antenna-cavity systems”

P15 Youwen Fan, (LPNO, University of Twente)“Theoretical study of passively mode locked external cavity diode lasers”

P16 Adonis Flores, (LaserLaB, VU University Amsterdam)“Simple method for producing Bose-Einstein condensates of metastable helium and rubidium using a single beam optical dipole trap”

P17 Jim Franssen, (Eindhoven University of Technology)“Longitudinal phase space characterization of ultracold electron bunches”

P18 Zhi Gao, (Molecular and Laser Physics, IMM, Radboud University)“Imaging product-pair correlations in bi-molecular collisions”

P19 J.O. Grasdijk, (University of Mainz)“Search for the permanent electric dipole moment of xenon”

P20 Ke Guo, (FOM Institute AMOLF)“Mapping the local density of states of periodic plasmonic nanostructures with stochastic super-resolution”

P21 Arjen de Haas, (FELIX Laboratory, IMM, Radboud University)“Structural determination of dissociation products of ionized N-containing PAHs”

7

Poster Program 2015P22 A. De Hoogh, (FOM Institute AMOLF)

“Creating and controlling polarization singularities in plasmonic fields near multiple subwavelength holes”

P23 G.S.M. Jansen, (Vu University Amsterdam and ARCNL)“Ulstrastable XUV interferometry for two pulse Fourier transform lensless imaging”

P24 J.Joger, (Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany)“A hybrid atom-ion trap for Li and Yb+”

P25 Tarun Johri, (Eindhoven University of Technology)“Rydberg system with single-site addressability”

P26 N. Kalb, (Delft University of Technology)“Protection of quantum coherence and entanglement through controlled decoherence”

P27 D.M. Kiawi, (FELIX Laboratory, IMM, Radboud University)“The interaction between molecules and metal oxide surfaces of clusters: IR spectroscopy and DFT calculations”

P28 M. Kiseleva, (Molecular and Laser Physics, IMM, Radboud University)“Traceable line strength measurements in methane in the spectral region around 1.6 µm using cavity ring down spectroscopy”

P29 A.L. La Rooij, (Institute of Physics, University of Amsterdam) “Sub-micron magnetic lattices for quantum simulation”

P30 A.J. van Lange, (Debeye Institute for Nanomaterials Science, Utrecht University)“Coupling ultracold atoms to nanophotonic membrane structures”

P31 G. Li, (Debeye Institute for Nanomaterials Science, Utrecht University)“Optical manipulation of Sodium BECs”

P32 G. Lochead, (van der Waals-Zeeman Institute, University of Amsterdam)“Rydberg excitation and dressing on atom chip”

P33 G.J.J. Lof, (Zernike Institute for Advanced Materials, University of Groningen)“Optical tuning and read-out of spin dynamics for triplet exitons in organic molecules”

P34 R. Logeman, (Atomic Nano Structures, IMM, Radboud University)“Transition metal oxide cluster magnetism: a FexOy

0/+ case study”P35 S. Machluf, (Institute of Physics, University of Amsterdam)

“A quantum platform using Rydberg atoms in magnetic lattices”P36 J. Mandon, (Molecular and Laser Physics, IMM, Radboud University)

“QCL-based sensors for exhaled CO analysis”P37 S.C. Mathavan, (Van Swinderen Institute, University of Groningen)

“Deceleration, cooling and trapping of SrF molecules for precision spectroscopy”P38 Amita Mohanty, (Van Swinderen Institute, University of Groningen)

“Measurement of the 5d2D5/2 state lifetime in single trapped Ba+ ion”P39 Amita Mohanty, (Van Swinderen Institute, University of Groningen)

“Atomic parity violation in single trapped ion via light shifts”P40 F. Nadeem, (Molecular and Laser Physics, IMM, Radboud University)

“New ray tracing simulation method for the modelling of reinjection caveties in OA-ICOS and CRDS”

P41 F. Nadeem, (Molecular and Laser Physics, IMM, Radboud University)“Applications of widely tunable external cavity quantum cascade lasers (EC_OCLs) in continuous wave and pulsed mode”

P42 A.H. Neerincx, (Molecular and Laser Physics, IMM, Radboud University)“Optical trace gas detection in human breath for disease diagnosis”

8

Poster Program 2015P43 R.P.M.J.W. Notermans, (LaserLaB, VU University Amsterdam)

“Measuring the 2 3S → 2 1S transition in metastable helium using a narrow linewidth 1557-nm laser”

P44 Jorick van ‘t Oever, (COPS, University of Twente)“Acoustooptical measurement of ultrasonic resonances in microfluidic channels”

P45 Oleksiy Onishchenko, (van der Waals-Zeeman Institute, University of Amsterdam)“Towards a strontium quantum gas microscope”

P46 Clara Osorio, (FOM Institute AMOLF)“Angle-resolved cathodoluminescence imaging polarimetry”

P47 N. Parappurath, (FOM Institute AMOLF)“Asymmetric transmission and optical activity in chiral photonic crystals”

P48 K. Perrier, (Debeye Institute for Nanomaterials Science, Utrecht University)“Bose-Einstein condensation in photons”

P49 A. Petrignani, (Leiden Observatory, Leiden University)“Gas-Phase spectroscopy inside a free electron laser cavity: Ionization and infrared spectra of hydrocarbon species”

P50 T.J. Pinkert, (LaserLaB, VU University Amsterdam)“Accurate time and frequency distribution over a 2x137 km optical fiber link”

P51 M. Plodzien, (Eindhoven University of Technology)“Controlling disorder with periodically modulated interactions”

P52 M.A.G. Porcel, (LPNO, University of Twente)“Numerical investigation of strain-optic devices based on surface acoustic waves and buried waveguides.”

P53 S. Pratama, (Debeye Institute for Nanomaterials Science, Utrecht University)“An efficient boundary element method for light-matter interaction in stratified backgrounds”

P54 Bob Rengelink, (LaserLaB, VU University Amsterdam)“A UV-IR two colour optical dipole trap for magic wavelength trapping of ultracold metastable helium”

P55 Jasper van Rens, (Eindhoven University of Technology)“Ultrafast experiments in a versatile SEM-based setup”

P56 Hinke Schokker, (FOM Institute AMOLF)“Lasing in plasmonic periodic, aperiodic, and disordered systems”

P57 R.U. Skannrup, (Eindhoven University of Technology)“Quatum transition in Rydberg crystals”

P58 Maarten L. Soudijn, (IOP, Utrecht University)“Magnetic lattice on a chip for quantum simulation with Rydberg superatoms”

P59 K.C. Sponselee, (Debeye Institute for Nanomaterials Science, Utrecht University)“Weak link and Faraday wave experiments in a ultra-cold Bose gas”

P60 Gerrit W. Steen, (WETSUS, European Centre of Excelllencefor Suistainable water Technology & University of Twente)“Gaussian curve fitting of Near-Infrared differential absorbance spectra for identification and quantification of electrolytes”

P61 Y. Tao, (Eindhoven University of Technology)“Quasi-phase matching high harmonic generation in a density modulated argon cluster jet”

P62 T.B.H. Tentrup, (MESA+ Institute for Nanotechnology, University of Twente)“Increasing the information content of photons”

´

9

Poster Program 2015P63 Ravitej Uppu, (MESA+ Institute for Nanotechnology, University of Twente)

“Light propagation in mirror-symmetric random media”P64 Nivedya Valappol, (Van Swinderen Institute, University of Groningen)

“Iodine spectroscopy for single ion precision experiments”P65 Wouter Verhoeven, (Eindhoven University of Technology)

“Ultrafast time-resolved (S)TEM using RF-cavities”P66 T.A.W. Wolterink, (MESA+ Institute for Nanotechnology, University of Twente)

“Programmable quantum interference in scattering materials”P67 Xu Yang, (Zernike Institute for Advanced Materials, University of Groningen)

“Charge state dynamics and electromagnetically induced transparency in 4H-SiC divacancy ensembles”

P68 Olger V. Zwier, (Zernike Institute for Advanced Materials, University of Groningen)“Realizing an all-optical quanum memory with divacancy spins in SiC”

P69 L. DeAngelis, (FOM Institute AMOLF)“Phase singularities in random waves: Exploring optical statistics at the nanoscale”

10

I1

Exciting physics with highly excited atoms

Klaus Mølmer

Physics and Astronomy, Aarhus University, Danmark

When two nearby atoms are excited from their ground states to states with high

principal quantum number n (so-called Rydberg states) their dipole interaction is

significantly increased. In small atomic ensembles, the Rydberg blockade may couple all

atoms and thus enable an on/off highly non-linear quantum control of their

collective many-body state.

In the presentation, I will review the basic physical mechanisms and present different

examples with Rydberg state control of atomic collective states. I will particularly

discuss how the interactions may be applied for quantum computing, entangled state

generation and atom-light interfaces for long distance quantum communication.

Reference: M. Saffman, T. G. Walker, K. Mølmer, Quantum information with Rydberg atoms; Rev. Mod. Phys. 82, 2313–2363 (2010).

11

O1 O2

J.P. de Jong1, A.R. Onur1, D. O’Shea1,

A.D. Wieck2, D. Reuter2,

and C.H. van der Wal1

1 Rijksuniversiteit Groningen2 Ruhr-Universität Bochum

We demonstrate an all-optical method to

enhance the dephasing time of an ensemble

of localized semiconductor electron spins, in

contact with a nuclear spin bath that causes

inhomogeneous broadening of the electron

spin Zeeman-splitting. The method reduces

fluctuations in nuclear spin polarization by

using two lasers for addressing the transitions

from the electron spin states to a shared

excited state (lambda systems). These lasers

drive dynamic nuclear polarization (DNP)

at the sharp spectral feature of coherent

population trapping (CPT), yielding self-

improving CPT or a split CPT lineshape,

depending on the sign of the laser detuning

from the excited state (Fig.1). This opens the

road to lifetime-limited coherence without

spin-echo techniques.

High precision spectroscopy of single 138Ba+ ions

E.A. Dijck, A. Mohanty, N. Valappol,

J.O. Grasdijk, O. Böll, A.T. Grier, K. Jungmann,

M. Nuñez Portela, L. Willmann

Van Swinderen Institute,

University of Groningen

Single Ba+ and Ra+ ions are well suited

for investigating the weak mixing angle

at low energy and to build atomic clocks.

These applications require understanding

the involved optical line shapes well. We

have studied the transition frequencies

in a single trapped 138Ba+ ion [1]. Two

lasers, referenced to a frequency comb,

address the L-configuration formed by

the lowest energy levels. We extract the

one-photon and two-photon components

of the line shape (see figure) using an

8-level optical Bloch model to achieve

100 kHz accuracy for the transition

frequencies between the 6s 2S1/2,

6d 2P1/2 and 5d 2D3/2 levels. This impro-

ves the knowledge of these frequencies

by two orders of magnitude.

[1] E.A. Dijck et al., Phys. Rev. A 91, 060501(R) (2015)

Suppressing nuclear spin fluctuationsaround semiconductor electrons via theinterplay of optical coherent populationtrapping and dynamic nuclear polarization

Laser feedback at detuned two-photon resonance

Electron spin polarizationaround CPT and resultingDNP (arrows)

Distribution of nuclear spin polarization after feedback

CPT signatures of succesful feedback on an nuclear spin bath in GaAs:Si

12

O3 O4

Precision QED tests in high vibrationalstates of H2

M.L. Niu, T. Madhu Trivikram,

E.J. Salumbides, and W. Ubachs

LaserLaB, VU University, Amsterdam

Highly excited vibrational level energies

in molecular hydrogen are determined by

two-photon Doppler-free spectroscopy.

The v = 12, J = 0 - 3 rovibrational levels

of H2 X1Σg state, lying only 2000 cm-1

below the first dissociation limit, were

populated by photodissociation of H2S

and their level energies were measured

at an accuracy of 2x10-3 cm-1. Excellent

agreement between the present results

and the best ab initio calculations, where

the experimental result is a factor of two

more precise than the calculation, provi-

des a gateway to further test theoretical

advances in this benchmark quantum

system. This includes calculations of

quantum-electrodynamic as well as non-

adiabatic effects in electron-correlated

systems. The investigations are extended

to the v=10-14 vibrational states in X1Σg,

where the calculations have the highest

uncertainties.

[1] M.L. Niu, E.J. Salumbides, and W. Ubachs, Test of quantum chemistry in vibrationally-hot hydrogen molecules. (submitted)

Focused ion beam based on laser coolingand compression of a thermal atomicbeam

S.H.W. Wouters, G. ten Haaf,

G. P. Offermans, O.J. Luiten, P.H.A. Mutsaers,

and E.J.D. Vredenbregt

Coherence and Quantum Technology group,

Eindhoven University of Technology

Laser cooling and compression is perfor-

med on atomic rubidium to generate a

high brightness beam that can be focused

to a nano-meter sized spot once photo-

ionized. Such a focused ion beam can be

used to image and edit integrated circuits

at the nano-scale which is important for

the ongoing downsizing of such ICs.

Simulations of the complete proposed

device show that the atomic beam

brightness can be increased by a factor

105 by using a compact 7 cm long

magneto-optical compressor and that,

after photo-ionization, a nanometer-sized

focus can be achieved for a beam current

of 10 pA which surpasses commercial

instruments. Experimentally the thermal

source and the magneto-optical compres-

sor have been realized.

+

+

13

I2

Breaking the limitation of silicon photonics

Michal Lipson

Columbia University, Ithaca, NY

Photonics on chip could enable a platform for monolithic integration of optics and

microelectronics for applications of optical interconnects in which high data streams

are required in a small footprint. This approach could alleviate some of the current

bottlenecks in traditional microelectronics. In this talk I will review the challenges and

achievement in the field of Silicon Nanophotonics and present our recent results.

Using highly confined photonic structures, much smaller than the wavelength of light,

we have demonstrated ultra-compact passive and active silicon photonic components

(including graphene on silicon) with very low loss. The highly confined photonic

structures enhance the electro-optical and non-linear properties of Silicon.

Michal Lipson is the Given Foundation Professor of Engineering at the School of

Electrical and Computer Engineering at Cornell University, Ithaca NY. She completed

her B.S., MS and Ph.D. degrees in Physics in the Technion in 1998. Following a

Postdoctoral position in MIT in the Material Science department from 1998 to 2001

she joined the School of Electrical and Computer Engineering at Cornell University as

an Assistant Professor. Lipson is one of the pioneers of the field of silicon photonics-

the ability to manipulate light on-chip. She holds over 20 patents and is the author of

over 200 technical papers. Professor Lipson’s honors and awards include Macarthur

fellow, Blavatkink Award, IBM Faculty Award, and NSF Early Career Award. She is a

fellow of the OSA (Optical Society of America) and of IEEE. In 2014 she was named by

Thomson Reuters as a top 1% highly cited researcher in the field of Physics.

Graphene modulator

14

O5 O6

Nonlinear measurement of nanomecha-nical motion caused by extreme optome-chanical coupling

Rick Leijssen, Lars Freisem and

Ewold Verhagen

Center for Nanophotonics, FOM Institute

AMOLF, Amsterdam

We used the subwavelength character of

optical modes in a sliced photonic crystal

nanobeam to enhance the interaction

of the light with the flexural motion of

the nanobeam. In this way, we achieved

photon-phonon coupling rates of 10

MHz, an order of magnitude larger than

previously shown. We show that in this

regime, the room-temperature readout

of thermal motion becomes highly non-

linear, especially in structures designed

to minimize optical losses. We discuss

the way such systems can be used for

classical and quantum sensing of motion.

Phase singularities in random waves:Exploring optical statistics at the nanoscale

L. De Angelis, R.E.C. van der Wel, B. le Feber,

and L. Kuipers

FOM Institute AMOLF, Amsterdam,

The Netherlands

Phase singularities are locations in which

the phase of a complex field is undefined.

In two-dimensional random waves these

deep-subwavelength (size zero) optical

entities are points in the plane, with

distributions reminiscent of those of

particles in ionic liquids [1]. By mapping

the in-plane complex optical field above

a chaotic resonator [2], we experimentally

determine the statistics of phase singula-

rities in random waves.

[1] M.V. Berry and M.R. Dennis. Proc. R. Soc. Lond. A (2000).

[2] C. Liu, et al. Nat. Phys. (2015).

Figure: Experimental pair correlation function (circles) andcharge correlation function (triangles) of phase singularitiesin random waves. Results are in excellent agreement withtheoretical predictions [1] (lines).

15

O7 O8

Towards a photon gas in a chirped photonic crystal

S. Greveling and D. van Oosten

Debye Institute for NanoMaterials Science and

Center for Extreme Matter and Emergent

Phenomena, Utrecht University

The achievement of Bose-Einstein

condensation of light in a dye-filled

cavity has opened up beautiful ways of

creating and controlling photon gases.

In our experiment, we want to create

a photon condensate in a periodic

potential. One approach to achieve this

is to make use of a large area photonic

crystal cavity. The design of such cavities

is a formidable computational task. We

present a semi-analytical approach to

design one- and two-dimensional cavities

[1]. Another approach is to add a periodic

potential to the dye-filled cavity system.

We will report on our progress following

both approaches.

[1] M.C.F. Dobbelaar, S. Greveling, and D. van Oosten, “Large area photonic crystal cavities; a local density approach”, Opt. Express 23, 7481 (2015)

Waveguide-integrated electrically-tunable quantum nodes

M. Petruzzella1, T. Xia1, F. Pagliano1, S.

Birindelli1, L. Midolo1, Z. Zobenica1, L.H. Li2,

E.H. Linfield2, and A. Fiore1

1 COBRA Research Institute, Eindhoven

University of Technology,2 School of Electronic and Electrical

Engineering, University of Leeds,

Leeds LS2 9JT (UK)

Semiconductor quantum dots (QDs)

embedded in photonic crystal nano-

cavities play a crucial role for the genera-

tion and manipulation of quantum light

in non-classical photonic architectures.

The unavoidable spread in the energy of

both emitters and cavities represent the

major experimental challenge in scaling

the number of qubits flowing across

these circuits. Here we report the full

energy control over a cavity-emitter node,

consisting of Stark-tunable QDs coupled

to electro-mechanically reconfigurable

double-membrane photonic crystal cavi-

ties. The all-electrical wavelength-tuning

of the emitter over 7.5 nm as well as an

8.5 nm mode shift are demonstrated

on the same device. Besides, a ten-fold

Purcell-enhancement of the spontaneous

emission rate of a single emitter is

measured at two distinct wavelengths.

Finally, we integrated this architecture

with ridge waveguides, needed to build a

low-loss photonic connection between

integrated solid-state qubits.

16

O9 O10

Perturbing open cavities: Anomalousresonance frequency shifts in a hybridcavity-antenna system

Freek Ruesink, Hugo M. Doeleman,

Ruud Hendrikx, A. Femius Koenderink,

and Ewold Verhagen

FOM Institute AMOLF

In electrodynamics, the influence of a

small perturbation on a resonant cavity

mode plays an important role in fields

like cavity quantum electrodynamics and

cavity optomechanics. Typically, the

resulting cavity frequency shift can be

directly related to the polarizability of the

perturbing object. Here we experimentally

show that in open, non-Hermitian

systems, particles perturbing a cavity can

induce strong frequency shifts that are

opposite to, and even exceed, the effects

based on the particles' polarizability. We

explain the results using a full electro-

dynamic theory, revealing that they rely

on a non-trivial phase relation between

cavity and nanoparticle radiation that

allows backaction via the radiation

continuum. An intuitive model based

on coupled mode theory relates the

phenomenon to retardation.

Polarization evolution in vector fieldsnear plasmonic nanowires

I.V. Kabakova, A. de Hoogh and L. Kuipers

FOM Institute AMOLF

Structural complexity of light fields

confined to nanoscale objects has become

the subject of intense research with

numerous applications in quantum

photonics [1] and biophysics [2]. The

field near nanostructures can exhibit

local orbital and spin angular momenta,

which can be exploited for manipulation

of dipole transitions, directional light

coupling or particle movements.

Plasmonic devices are superior in light

confinement to subwalength areas. Here

we study the polarization evolution of

vector fields near gold nanowires on a

glass substrate. We perform three-

dimensional near-field microscopy to

map the polarization of an evanescent

field in different planes above the nano-

wire. We find that the field is linearly

polarized in the centre of the nanowire,

but circular close to its edges, in agree-

ment with numerical modelling perfor-

med using finite difference time domain

method. Our findings show promise for

future quantum information processing

applications, in particular directional

coupling of dipole emission to nanoscale

plasmonic networks.

[1] Petersen et. al. Science 346, 67–71 (2014). [2] Hendry et. al. Nat. Nanotechnol. 5, 783–787

(2010).

17

I3

Evening lectureLighting has changed

Frank Penning

Philips Lighting Solutions, BU Home Systems.

Lighting has been changing, and still is. From the days of the experimental carbon arc

burners and carbon filament samples, to a completely internet-connected, home

lighting system. The speed of innovation is still accelerating, mainly due to the open

interfaces that are game changing lighting applications.

We are now seeing an enormous speed in which so called ‘conventional’ lighting

technology is being replaced with LED lighting of which again a part will be internet

connected LED technology. This provides an enormous opportunity to change the

lighting landscape.

Whereas lighting has been taken for granted for a long time, positioned in a purely

functional role, we see now new lighting applications appear in both professional areas

as in consumer homes.

Next to new lighting centric applications we are also creating new joint applications

with domains that were earlier alien to lighting: heating, gaming, entertainment,

home automation etc.

In professional segments like street, shop and office lighting the sensing and control

gives building owners, street authorities and others a new toolset to better serve

their customers.

By providing consumers with internet-connected lightbulbs, they can now personalise

their living rooms, create the ambience and atmosphere they want.

The technical backbone that enables these use cases and the open interfaces we created

has led to an ever increasing developer community that bring new and better use cases

to the users of the system.

The Internet of Things may be hyped

but is coming, and lighting –

due to its ubiquity - plays a key role in it.

18

I4

The magic of velocity map imaging

David H. Parker

Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University

In 1997 my graduate student Andre Epping and I published an improvement of the

ion imaging method of Chandler and Houston from 1987 (1) which we called

velocity map imaging(2). Since then, this technique has made a major impact on

the fields of atomic and molecular physics. For example, our 1997 article has been

cited more than 1650 times. In this talk I will highlight the work of our group but

also many other groups around the world using and improving velocity map imaging

in research ranging from attosecond dynamics to analytical mass spectrometry.

1. D.W. Chandler and P. Houston, J. Phys. Chem. 19872. A.T.J.B. Epping and D.H. Parker, Rev. Sci. Instrum. 1997

19

O11 O12

Imaging partial wave resonances in low-energy NO-He collisions

Jolijn Onvlee, Sjoerd N. Vogels,

Simon Chefdeville, Ad van der Avoird,

Gerrit Groenenboom,

Sebastiaan Y.T. van de Meerakker

Radboud University Nijmegen

Atom-molecule collisions can often be

understood to a large extent in terms

of classical hard-sphere collisions.

However, at low collision energies, the

collision partners can temporarily form

quasi-bound complexes before they

recede, resulting in peaks in collision

cross sections as function of energy.

Furthermore, scattering calculations

predict dramatic changes in the angular

distribution of the collision products as

function of energy around these so-called

resonances, as shown in the figure.

Measuring these resonances and angular

distributions has proven extremely

challenging. Our combination of Stark

deceleration and velocity map imaging

allowed us to study resonances for

collisions between NO radicals and He

atoms and we could study for the first

time how resonances affect the angular

distributions of the scattered molecules.

Infrared spectra of ionized primary alcohols at 4 K

Alexander Stoffels1, Britta Redlicht1,

Giel Berden1, Jos Oomens1, Oskar Asvany2,

Sandra Brünken2, Pavol Jusko2,

Sven Thorwirth2, and Stephan Schlemmer2

1 Radboud University, FELIX Laboratory2 Universität zu Köln, Germany

Cryogenic ion traps have become popular

devices in action-spectroscopy techniques

as the low ion temperature enhances

spectral resolution. Coupling a 22-pole

ion trap to the FELIX Free-Electron Laser

has shown great opportunities [1] and a

new cryogenic trap (FELion) has recently

been coupled to FELIX, providing tunable

infrared radiation from 3 to 150 µm,

covering the entire “fingerprint region”

of vibrational spectra.

Here we present the first 4-K infrared

spectra of He-tagged ionized methanol

and ethanol, both as protonated and

radical cation species. Using FELIX and

an OPO source, these vibrational spectra

cover the spectral range from 3700 cm-1

to 550 cm-1. The H-O-H stretching and

bending modes clearly distinguish the

protonated alcohols from their neutral

analogs. Comparison with IR-MPD

spectra of the bare ion indicate that the

perturbation caused by the He-atom is

minimal. Vibrational bands were assigned

using quantum-chemical calculations,

corresponding favorably with experimen-

tal data.

[1] Asvany et al.: Science 309, 1219-1222 (2005)

20

O13 O14

Competitive hydrogen bond interaction:Conformer selective IR action spectroscopy of Saligenin-water clusters

Arghya Dey, Daniël Bakker, Qin Ong and

Anouk Rijs

Radboud University, Institute for Molecules

and Materials, FELIX Laboratory

Predicting the microsolvation behavior ofintramolecular hydrogen-bonded molecules is quite challenging due to competing inter-actions between existing intramolecularhydrogen bond and nascent intermolecularhydrogen bonding with solvent molecules.Saligenin possess intramolecular O–H…O hydrogen bond between the phenolic OH and benzylic OH groups substituted on adjacent carbon atoms of benzene ring. Dueto coexistence of the aforementioned functional groups, it can be considered as a“fusion” of phenol and benzyl-alcohol. Thehydrogen bonding pattern for water clustersof phenol and benzyl-alcohol are dissimilar.Therefore, saligenin-water complexes canprovide an interesting outcome validating its inclination for “phenol-water” or “benzyl-alcohol-water” type complexes.Saligenin-(H2O)n clusters were investigatedusing IR-UV double resonance spectroscopyand the experimental findings were equatedwith theoretical predictions from ab initiocalculations.

Towards cold collisions in a molecularsynchrotron

A.P.P. van der Poel1, P.C. Zieger1,2,

S.Y.T. van de Meerakker3, and H.L. Bethlem1

1 LaserLaB, Department of Physics and

Astronomy, VU University Amsterdam2 Fritz-Haber-Institut der Max-Planck-

Gesellschaft, Berlin3 Radboud University Nijmegen, Institute for

Molecules and Materials

We aim to study resonances in collisions

between ammonia molecules, stored in

a molecular synchrotron [1], and beams

of hydrogen molecules [2]. The advantage

of using a synchrotron is two-fold: (i)

The collision partners move in the same

direction, resulting in a small relative

velocity and thus a low collision energy

(down to 5 cm-1). (ii) By storing mole-

cules many roundtrips, the sensitivity to

collisions is enhanced [3]. We give an

update on the status of the experiment,

including first signal of collisions.

[1] Zieger et al., PRL 105, 173001 (2010) [2] A. v/d Avoird, G.C. Groenenboom, priv. comm.[3] Van der Poel et al., NJP 17 (2015) 055012

21

I5

Using molecular vibrations to control electronic dynamics in organic materials and devices

Artem A. Bakulin

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB30HE, UK

The ‘soft’ character of organic materials leads to strong coupling between molecular

nuclear and electronic motions. I will present a set of spectroscopic approaches to

observe and exploit the vibrational-electronic coupling organic electronic systems.

Using 2D electronic spectroscopy, we observed that in pentacene molecular crystal

intramolecular Raman-active modes assist the formation of a vibrational-electronic

manifold of multiexcitonic triple-pair states, which strongly mix with the singlet

excitons. These states allow singlet fission in pentacene to proceed on the sub-100 fs

timescale with unity efficiency, which makes pentacene derivatives promising materials

for photovoltaic applications. We also show that optical excitation of IR-active modes

of pentacene can lead to selective modulation of charge transport. For example,

excitation of certain modes in the 1500-1700 cm-1 region leads to photocurrent

enhancement in pentacene-based photodiodes. Our results reveal that the presence

of rich vibrational manifolds in organic semiconductors facilitates the formation of

band-like electronic structures and allowing fast and efficient electronic processes.

This outlines the potential of vibrational phenomena for the development of future

organic electronic materials and devices.

22

O15 O16

Yuwei Jin, Simona M. Cristescu,

Julien Mandon, and Frans J. M. Harren

Molecular and Laser Physics,

Institute for Molecules and Materials,

Radboud University Nijmegen

We demonstrate the observation of the

Vernier effect within a femtosecond

synchronously pumped optical parametric

oscillator. By simply detuning the cavity

length, the repetition frequency of the

resonating signal can be tuned from several

GHz to 1 THz. The pump source is a femto-

second mode-locked laser with a 2 W

average power and 90 MHz repetition

frequency. This observation offers a simple

method for the active filtering of dense

frequency comb lines instead of using

Fabry-Perot cavities with complex locking

system to reach tens of GHz comb spacing.

We believe that this tunable optical

parametric oscillator will be an ideal source

for astro-comb generation in the future by

means of active stabilization.

A mirrorless photonic free-electron laser oscillator

Peter van der Slot, A. Strooisma, T. Denis,

and K.J. Boller

Laser Physics and Non-Linear Optics,

MESA+ Institute for Nanotechnology,

University of Twente

In a photonic free-electron laser,

electrons stream through a photonic

crystal and generate coherent Cherenkov

radiation when the crystal supports a

phase-matched radiation field with non-

zero longitudinal electric field component

[1]. Depending on the electron beam

energy, the interaction can be of the

forward (high beam energy) or backward

(low beam energy) type.

Here, we consider a backward-wave

interaction as the low beam energy

results in a compact device. Furthermore,

the backward-wave interaction provides a

feedback mechanism for the interaction,

which results in an oscillator-like

behaviour without the presence of

external mirrors. The backward-wave

interaction results in a high output

power from a short gain section without

the presence of longitudinal modes.

Hence this device is continuously tunea-

ble by varying the electron beam energy.

We report on numeric modelling of such

a device, and discuss the lasing dynamics,

which include start-up (threshold),

saturation, mode content and tuning

characteristics.

[1] P.J.M. van der Slot, et al. IEEE Photon. J. 4, 570 (2012).

Vernier effect within a femtosecond optical parametric oscillator for Broad-tunable, ultra-high repetition rate oscillation

Figure: Observed signal spectra with different detunedcavity lengths. Comb structures can be resolved for largecomb spacing by using a Fourier transform spectrometer.

23

O17 O18

Narrow-band Zr-coated Ni/Si multilayerBorrmann filter

J.L.P. Barreaux1, I.V. Kozhevnikov3,

H.M.J. Bastiaens1, R.W.E. van de Kruijs2,

F. Bijkerk2 and K.J. Boller1

1 Laser Physics and Nonlinear Optics,

University of Twente2 XUV Optics, University of Twente3 Institute of Crystallography,

Russian Academy of Sciences

Advanced extreme ultraviolet (EUV)

sources, currently under development

for high volume lithographic nano-

fabrication, are capable to generate

powerful radiation in the 13.5 nm-band,

but also emit a significant amount of

out-of-band radiation, requiring new

filtering methods for reliable spectral

monitoring.

We present a solution exploiting the

Borrmann effect – the anomalous

increase in the intensity of transmitted

radiation when in Bragg reflection – in

multilayer optics, and promising tunable

and narrow-band EUV transmission

filters. We designed a Zr-coated Ni/Si

multilayer Borrmann filter with an

optimum transmission-to-bandwidth

ratio at 13.5 nm and normal incidence,

which might be suitable for fabrication.

Calculations show a strong, narrow-band

peak of 0.23 nm bandwidth centered

at 13.5 nm, corresponding to a relative

bandwidth of 1.7%. Other specific

wavelengths and bandwidth values can be

achieved with a modification of the layer

thicknesses and the number of bi-layers.

Optical study of vapor nanobubbles formed around a continuously laser-heated gold nanosphere in a liquid

Lei Hou, Nico Verhart, Michel Orrit*

Huygens-Kamerlingh Onnes Laboratory,

Leiden University, Leiden, the Netherlands

* Orrit@physics.leidenuniv.nl

Nanobubbles show fascinating properties

such as localized high temperature and

pressure, which open applications in

photothermal therapy, chemistry in nano-

reactors, or enhanced photo-acoustic

coupling [1]. We study the dynamics of a

single plasmon-assisted nanobubble using

photothermal and direct probe detection

methods, down to the nanosecond,

single-shot regime. We find that nano-

bubble formation is explosive even under

continuous heating, and that complex

behaviors such as acoustic wave genera-

tion by the explosion and echo-triggered

explosion are observed. The overheated

liquid layer surrounding the hot nano-

particle is thought to be responsible for

those complex phenomena. Despite the

fast dynamics of nanobubbles on a nano-

second time scale, we show that it is pos-

sible to stabilize the nanobubble for times

as long as microseconds with a proper

time profile of the heating beam [2].

[1] Lukianova-Hleb, E. Y. & Lapotko, D. O.Experimental techniques for imaging and measuring transient vapor nanobubbles. Appl. Phys. Lett. 101, 264102, (2012).

[2] Hou, L., Yorulmaz, M., Verhart, N. & Orrit, M. Explosive formation and dynamics of vapor nanobubbles around a continuously heated gold nanosphere. New J. Phys. 17, 013050, (2015).

24

O19 O20

Lasing characteristics of two dimensional surface plasmon lasers in an active meta-material

Vasco T. Tenner, Michiel J.A. de Dood,

and Martin P. van Exter

University Leiden

We present an experimental study on

surface plasmon laser action in an active

meta-material, comprising of a loss

compensated metal hole arrays and a

semiconductor gain medium.

The observed surface plasmon dispersion

relation reveals the four relevant modes

for the laser action. Dark and bright

modes are observed and radiation loss is

identified as the main discriminator in

laser threshold. We quantify this loss,

and the two relevant scattering rates in

the system.

The radiated laser emission has a peculiar

donut-shaped beam profile. both in the

near field and far field (see Figs.). We

measure the opening angles of these

beams and explain their origin.

Furthermore we observe and explain the

spatial emission and phase profile in the

near field, which is ring shaped.

K-space polarimetry measurements ofthe spin-dependent emission fromarrays of chiral plasmonic nanoantennas

Michele Cotrufo1 and

A. Femius Koenderink2

1 COBRA Research Institute,

Eindhoven University of Technology,

5600 MB Eindhoven, The Netherlands2 Center for Nanophotonics,

FOM Institute AMOLF, Science Park 104,

1098 XG Amsterdam, The Netherlands

We present angle-resolved polarimetry

measurements of the emission from 2D

arrays of chiral metallic nanoparticles

embedded in a light-emitting dye-doped

slab. We show how the geometric

chirality of the array's unit cell induces

a preferential circular polarization in

the far-field emitted light. The spectral

dependence of this asymmetry indicates

that both the localized surface plasmon

resonance and the delocalized hybrid

plasmonic-photonic mode, created by

the diffractive coupling of the single

structures, contribute to the phenome-

non. By mapping the angle-resolved

degree of circular polarization of the

emission we demonstrate how the

delocalized hybrid mode can efficiently

redirect the light into different narrow

directions according to the circular

polarization state. Our findings show

that angle-resolved measurements are an

essential tool for investigating the light

spin-orbit effect in a periodic array of

plasmonic structures, since the collective

effects can introduce a non-trivial

behaviour in the angular spectra.

25

I6

The fascination of lanthanides for ultracold quantum physics

F. Ferlaino

Institut für Experimentalphysik, Universität Innsbruck and IQOQI-Institut für Quantenoptik und

Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria

Given their strong magnetic moment and exotic electronic configuration, lanthanide

atomic species disclose a plethora of intriguing phenomena in ultracold quantum

physics. The large magnetic moment of these atoms reflects on a strong interparticle

dipole-dipole interaction, which has both a long-range nature and an isotropic

character. Here, we report on our latest results on quantum many-body and few-body

physics based on a strongly-magnetic lanthanide atoms, erbium (Er). Particular

emphasis will be given to the scattering properties of bosonic and fermionic Er,

in which unconventional and fascinating phenomena appear as a result of both

the magnetic and the orbital anisotropy of the underlying the native interactions

between atoms.

26

P1 P2

Ramsey-Comb spectroscopy in the deep-ultraviolet spectral region

R.K. Altmann, L.S. Dreissen1 S. Galtier,

and K.S.E. Eikema

LaserLaB Vrije Universiteit Amsterdam,

De Boelelaan 1081, 1081 HV Amsterdam

Laser spectroscopy is an excellent tool

for ultra-precise tests of Quantum-

Electrodynamic theory (QED) in bound

atomic systems such as atomic hydrogen

and helium. Recently, due to the theore-

tical work of Pachucki and co-workers,

also molecular hydrogen, the benchmark

system for molecular spectroscopy, has

become an interesting candidate for

precision tests.

Experimentally, spectroscopy of simple

atoms or molecules poses great challenges

as UV or XUV radiation is required to

drive the fundamental transitions. We

developed a new excitation method,

‘Ramsey-comb spectroscopy’ (Nature

Physics 10, 30-33 (2014)) that enables

ultra-high accuracy spectroscopy (kHz-

level and possibly better) with amplified

frequency comb laser pulse pairs that can

easily be up-converted to shorter wave-

lengths. After our initial demonstration

at 760 nm in Rb we now present the

first Deep-UV two-photon Ramsey-comb

spectroscopy at 212 nm in krypton. A

future target is spectroscopy in molecular

hydrogen, and we are working on exten-

ding Ramsey-comb spectroscopy with

high-harmonic generation to reach much

shorter wavelengths (<60 nm) to test

QED in singly-ionized helium.

The rotational memory effect of amultimode fiber

Lyubov Amitonova, Allard P. Mosk and

Pepijn W.H. Pinkse

Complex Photonic Systems (COPS),

MESA+ Institute for Nanotechnology,

University of Twente

Fiber-optic technologies provide a broad

variety of powerful tools for biological

applications, remote sensing and com-

munication. Multimode fibers potentially

offer better resolution compared to

widely used fiber bundle probes. The

main problem of multimode fiber based

methods is invasiveness as well as slow

recalibration after bending.

Here, we show the rotational memory

effect in a multimode fiber. Rotating the

incident wavefront around the fiber

core axis leads to a rotation of the resul-

ting pattern of the fiber output, while

maintaining a high degree of correlation

(Fig.1). Exploiting the memory effect

opens new ways to non-invasive imaging

through a multimode fiber by using

speckle correlations as well as almost two

orders of magnitude faster scanning of

the focused laser spot through a fiber.

27

P3 P4

Diagnostics of a photonic free-electron laser

R. Amram, J. Krowka, P.J.M van der Slot,

and K.J. Boller

Laser Physics and Nonlinear Optics, Mesa,

University of Twente

A photonic free-electron laser (pFEL)

generates coherent Cerenkov radiation

from electrons streaming through a

photonic crystal (PhC). To achieve the

radiation a close synchronism between

the phase velocity of the electromagnetic

wave and the velocity of the co-propaga-

ting electrons has to be obtained.

Therefore, the characterization and

co-alignment of the electron beam with

FEL radiation inside the photonic crystal

structure are important aspects for pFEL

performance. A commercial dispenser

electron gun, usually applied in traveling-

wave tubes, has been selected as electron

source. This particular electron gun

provides about 2A of beam current at

its nominal beam energy of 14.2 keV.

We present diagnostic methods for the

electron beam, developed in our group,

based on Faraday cup and capacitive

pickup.

Electronic Spectroscopy of C6H, C6D,and 13C6H

X. Bacalla1,2, D. Zhao3, E.J. Salumbides1,4,

H. Linnartz2, and W. Ubachs1,3

1 LaserLaB, VU University Amsterdam2 Sackler Laboratory for Astrophysics,

Leiden Observatory3 Advanced Research Center for

Nanolithography (ARCNL)4 Department of Physics, University of

San Carlos

The hexatriynyl radical C6H is among

the spectroscopically best studied linear

carbon chains belonging to the C2nH

series. It has been identified as an impor-

tant reactive intermediate in combustion

chemistry and is prevalent in plasma

environments as well as in the inter-

stellar medium. Accurate microwave data

are available for the X2Π ground state

and matrix isolation experiments have

provided approximate band origin values

for a number of electronic transitions.

As an extension to these studies, we

present in this poster a comprehensive

gas phase survey of a number of vibronic

bands of C6H combining cavity ring-

down spectroscopy and supersonic plasma

jets. We also include the corresponding

spectra of the deuterated (C6D) and the

fully 13C-substituted (13C6H) molecule

which all aid in the vibronic analyses for

each of the isotopologues.

28

P5 P6

Towards a full understanding of gasphase far infrared action spectroscopy

Daniël Bakker1 Atze Peters1, Jérôme Mahé2,

Marie-Pierre Gaigeot2, Anouk Rijs1

1 Molecular and BioPhysics / FELIX laboratory,2 LAMBE, Université d’Evry val d’Essonne

Far-IR action spectroscopy has shown to

be a promising method for identifying

structural motifs in large (bio)molecules

via delocalized structural vibrations and

the direct probing of hydrogen bonds.

Static harmonic quantum chemical cal-

culations, used to identify the molecular

structure responsible for measured IR

spectra, do not reproduce features in

the far-IR well, due to a high degree of

anharmonicity and mode couplings.

Here, we present far-IR spectra of a family

of phenolic molecules, obtained using

the free electron laser FELIX. The studied

systems display intramolecular hydrogen

bonding, enabling us to study the merits

of far-IR action spectroscopy. Moreover,

these far-IR experiments allow us to test

the limits of the harmonic approximation

in static DFT calculations, and to explore

Born-Oppenheimer Molecular Dynamics,

more sophisticated simulations that allow

us to treat anharmonicity in vibrational

modes implicitly.

Towards a quantum gas of RbSr ground-state molecules

A. Bayerle, A. Ciamei, B. Pasquiou,

C.C. Chen, and F. Schreck

Van der Waals-Zeeman Institute, Institute of

Physics, University of Amsterdam

We are pursuing the creation of a quan-

tum gas of RbSr ground-state molecules

as novel platform for quantum simula-

tions. These molecules possess both an

electric and a magnetic dipole moment,

giving us a large parameter space to

design molecular interactions. This tuna-

bility opens new paths to solve the long-

standing challenge of creating a quantum

gas of ground-state molecules and will

allow us to investigate a rich variety of

strongly interacting many-body quantum

systems.

So far, we have loaded Rb Sr quantum

gases into an optical lattice, creating a

Mott insulator with more than 35.000

lattice sites occupied by one Rb and

one Sr atom each. These are ideal starting

conditions for the association of atom

pairs into weakly-bound RbSr molecules

through optical transitions, shrinking

the two-body wave function volume by a

factor of 1000, a significant step towards

the rovibronic ground-state. We have

found suitable optical transitions and

are currently adapting our molecule

association method to their properties.

29

P7 P8

Towards an ultracold metastable heliuminterferometer for measuring α

R. van der Beek and W. Vassen

LaserLaB, Department of Physics and

Astronomy, VU University Amsterdam

By accelerating a Bose-Einstein conden-

sate (BEC) of metastable 4He atoms in a

moving vertical standing-wave light field,

we plan to measure the one-photon

recoil velocity in an atom interferometer

setup. High precision measurements of

the one photon recoil velocity then allow

an extremely accurate determination

of the ratio h/M. Combined with well-

known values for the Rydberg constant,

the electron mass and the mass of the

helium atom, this potentially provides

an accurate determination of the fine-

structure constant α.

Comparing this value of α with the

value deduced from measurements of

the electron g-factor provides a stringent

test of quantum electrodynamics (QED)

theory. For this project, a metastable

helium BEC setup is currently being

constructed. Here we report on the

progress of the construction of the beam

apparatus and design of the magnetic

trap. In the near future, we will trap the

helium atoms in a magneto-optical trap

(MOT) and cloverleaf magnetic trap,

where they will be cooled towards BEC

and loaded into a dipole trap.

Quantum magnetism with Rydberg-dressed ground state atoms

Rick van Bijnen and Thomas Pohl

Max-Planck Institut für Physik komplexer

Systeme, Dresden, Germany

Atoms excited to Rydberg states with

high principal quantum numbers

n = 20 .. 100 acquire extreme properties,

such as van der Waals interactions whose

strength scales with a formidable n11.

Consequently, Rydberg atoms can directly

interact across several sites in an optical

lattice, and provide a promising toolbox

to engineer interesting magnetic phases

in ultracold atomic experiments.

We devise a scheme to harvest these

huge interaction strengths, and engineer

effective spin-spin interactions between

ground state atoms [1]. We employ

off-resonant laser-dressing of the ground

state atoms to Rydberg P-states, giving

rise to Ising-type interactions as well as

exchange interactions. We show how

the effectiveness of the Rydberg-dressing

technique can be greatly enhanced by

exploiting specific features of the pair

potential spectrum of Rubidium.

[1] PRL 114, 243002 (2015)

30

P9 P10

Breath sampling protocols for aromaanalysis in food science

Phil Brown1,2, Ewa Szymanska1,2,

Max Batenburg3, Sara Martins3,

Frans Harren1, and Aldo Ziere3

1 IMM, Radboud University2 TI-COAST3 Unilever R&D, Vlaardingen

Results are explained from four breath

sampling protocols with two tasting

solutions; milk and water, spiked with

four aroma compounds. Measurements

of nasally exhaled breath are made with

proton transfer reaction mass spectro-

metry. The first three protocols investigate

the effect of breathing control on measu-

red aroma release reproducibility: a free

protocol is used as a baseline; a further

protocol fixes the swallowing time; a

third protocol fixes the swallowing time

and the breathing rate. The fourth proto-

col investigates the effect of multiple

swallowing on total aroma release. A

study of eight subjects, repeating each

protocol five times for both solutions

produced a large data set, which was

analysed for reproducibility of each

protocol.

Precision measurements based on coldmolecular ammonia

C. Cheng, A.P.P. van der Poel,

and H.L. Bethlem

LaserLaB, Department of Physics and

Astronomy, VU University Amsterdam

Effects of fundamental physics can be

revealed through ultra-precise measure-

ments of molecular structure. In recent

experiments it was shown that polar

molecules can be decelerated, trapped

and bunched using time-varying electric

fields. The unparalleled control over

the motion of molecules offers unique

possibilities for precision experiments.

We are combining the techniques of

molecular trapping and frequency comb

lasers, to perform accurate measurements

of ammonia vibrational transitions. Due

to the long interaction times between

the ammonia sample and probe laser,

selected transitions will be measured

with great accuracy.

[1] M. Quintero-Perez, P. Jansen, T.E. Wall, J.E. van den Berg, S. Hoekstra, and H.L. Bethlem, Phys. Rev. Lett. 2013, 110, 133003.

[2] M. Quintero-Perez, T.E. Wall, S. Hoekstra, and H.L. Bethlem, J. Mol. Spectr. 2014, 300, 112.

´

31

P11 P12

Towards a perpetual atom laser

C.C. Chen, S. Bennetts, B.B. Pasquiou,

and F. Schreck

Van der Waals-Zeeman Insitute, Institute of

Physics, University of Amsterdam

Like the development of the continuous

optical laser, the development of a

perpetual atom laser has the potential to

revolutionize numerous application areas

particularly in precision measurement.

Yet, despite a decade of effort a perpetual

atom laser has still not been demon-

strated. We are constructing a perpetual

atom laser based on strontium as out-

lined below. Previous efforts using

rubidium began evaporation from

phase space densities of 10-8 [1] while

strontium should allow us to begin from

0.1 or better [2]. By using successive

cooling stages separated in space rather

than time, a continuous beam of atoms

may be cooled to degeneracy.

[1] T. Lahaye et al, Phys. Rev. A. 72, 033411 (2005).

[2] S. Stellmer et al, Phys. Rev. Lett. 110, 263003 (2013).

Towards time-resolved experiments probing of the electron-phonon couplingin clusters

Valeriy Chernyy, Remko Logemann,

Joost Bakker, and Andrei Kirilyuk

Atomic Nano Structures, IMM,

Radboud University

The electron-phonon coupling is respon-

sible for many physical phenomena such

as superconductivity, polarons, or the

acoustoelectric effect. To study this effect

we employ size-selected clusters in the

gas-phase, offering a well-defined and

fully controllable system. The clusters are

pumped using IR light, and subsequently

detected through UV photoionization.

The UV photoionization spectrum reveals

electronic states that are only populated

if the IR laser is in resonance with vibra-

tional transitions in the cluster. Here we

investigate the IR and UV characteristics

of niobium- and tantalum carbide

clusters using IR- and UV spectroscopy

as prerequisite for a time-resolved experi-

ment on the dynamics of the electron-

phonon coupling in these clusters.

Figure: Photoionization yield of Nb3C2 clusters (top) and population of orbitals close to the Fermi level (bottom; population in red, orbitals black).

32

P13 P14

The Nijmegen Zeeman decelerator:design and implementation

Theo Cremers, Simon Chefdeville,

Niek Janssen, Peter Claus, Edwin Sweers,

and Sebastiaan Y.T. van de Meerakker

Molecular and Laser Physics, Institute for

Molecules and Materials, Radboud University

Zeeman deceleration is a technique

used to control the velocity of a beam of

neutral atoms/molecules with a magnetic

dipole moment. Particles with unpaired

electrons naturally have this magnetic

dipole moment, this includes most atoms

and some molecular species (NH, OH,

and O2). So far this technique has mostly

been used in spectroscopic experiments.

We have developed a new concept for

a Zeeman decelerator, which is ideally

suited for applications in molecular

collision experiments. In this new design,

transverse and longitudinal focusing is

separated by using alternating hexapole

and solenoid elements. Three-dimensio-

nal Monte Carlo particle trajectory

simulations predict favorable particle

density distributions. Two separate

implementations of this concept are in

development, where the key difference is

the cooling method of the solenoids.

Large Purcell factors in hybrid antenna-cavity systems

Hugo Doeleman, Ewold Verhagen and

Femius Koenderink

FOM-Institute AMOLF, Amsterdam,

The Netherlands

A Hybrid antenna-cavity systems are a

promising candidate for ultrastrong light-

matter coupling123. If properly combined,

these systems can profit simultaneously

from both the cavity’s long photon stora-

ge time and the antenna’s strong field

localization. Losses usually associated

with plasmonics can be readily avoided.

We demonstrate theoretically that hybrid

systems can show Purcell enhancements

far exceeding those of the bare cavity

and antenna. Surprisingly, this requires

neither a very good cavity nor a good

antenna to start with. Moreover,

enhancements show highly asymmetric

and tunable Fano lineshapes.

Cavity and antenna are modeled as

coupled harmonic oscillators and predic-

tions are confirmed using finite-element

simulations. Additionally, we show first

experimental results on the fabrication

of hybrid systems.

1 Hong, Yan, et al. "Directed Assembly of

Optoplasmonic Hybrid Materials with Tunable

Photonic-Plasmonic Properties."The Journal of

Physical Chemistry Letters (2015).2 Barth, Michael, et al. "Nanoassembled

plasmonic-photonic hybrid cavity for tailored

light-matter coupling." Nano letters 10.3

(2010): 891-895.3 Xiao, Yun-Feng, et al. "Strongly enhanced

light-matter interaction in a hybrid photonic-

plasmonic resonator." Physical Review A 85.3

(2012): 031805.

33

P15 P16

Theoretical study of passively mode locked external cavity diode lasers

Youwen Fan1, Yvan Klaver1,

Valentina Moskalenko2, Erwin Bente2,

Julien Javaloyes3, Peter van der Slot1,

and Klaus Boller1

1 University of Twente, the Netherlands2 Eindhoven University of Technology,

the Netherlands3 Universitat de les Illes Balears, Spain

Monolithic mode locked diode have seen

seen rapid advancements during the

past decade. However, despite an ultra-

compact format and rapidly improving

performance, those lasers also suffer

from large intrinsic phase noise caused

by index-gain coupling. To reduce phase

noise and more freely chose the repetition

rate, we consider hybrid-integration,

where the semiconductor waveguide is

extended with a glass waveguide circuit.

Several advantages might be gained

because glass waveguides offer extremely

low loss (<0.1 dB/cm) and enable propa-

gation of pulses with orders of magnitude

higher peak power. The latter is due to

an increased bandgap energy (> 4 eV

for Si3N4) which prevents undesired

nonlinear effects, such as two-photon

absorption. In this work, we present a

theoretical study of passively mode locked

diode lasers, making use of an external

cavity comprising Si3N4/SiO2 wave-

guides. Different operational regimes of

the mode locked lasers are identified, as

preparation for further experiments.

Adonis Flores, Hari Prasad Mishra,

Wim Vassen, and Steven Knoop

LaserLaB, Department of Physics and

Astronomy, VU University, Amsterdam

We report on our efforts to realize an

ultracold mixture of metastable triplet4He (4He*) and 87Rb to study ultracold

collisions [1], in particular the interplay

between interspecies Penning ionization

and Feshbach resonances. Last year we

have realized a Bose-Einstein condensate

(BEC) of 87Rb in the F=2, mF=2 hyperfine

substate [2], using forced evaporative

cooling in a quadrupole magnetic trap

(QMT) and subsequent transfer to a

single beam optical dipole trap (ODT).

Recently, we have successfully applied a

similar scheme to 4He*, providing a

simple method for producing 4He* BECs

[3]. Currently we are working on simul-

taneous preparation of 4He* and 87Rb

in the single beam ODT.

[1] K. Jachymski, M. Krych, P.S. Julienne, Z. Idziaszek, Phys. Rev. Lett. 110, 213202 (2013)

[2] H.P. Mishra, A.S. Flores, W. Vassen, S. Knoop, Eur. Phys. J. D 69, 52 (2015)

[3] A.S. Flores, H.P. Mishra, W. Vassen, S. Knoop, in preparation

Simple method for producing Bose-Einstein condensates of metastable helium and rubidium using a single beam optical dipole trap

34

P17 P18

Longitudinal phase space characterization of ultracold electronbunches

Jim Franssen1, Jeroen kromwijk1,

Edgar Vredenbregt1,2, Jom Luiten1,2

1 Group Coherence & Quantum technology2 Institute for Complex Molecular Systems

Eindhoven University of Technology

P.O. Box 513, 5600 MB, The Netherlands

We are developing an ultrafast and

ultra-cold electron source, based on near-

threshold, femtosecond photoionization

of laser-cooled and trapped rubidium gas.

Recently, we demonstrated electron

crystallography of graphite for the first

time using the ultra-cold source. The ulti-

mate goal is ultrafast, single-shot elec-

tron crystallography of macromolecules,

which requires a high degree of control

over the phase space distribution of the

dense electron bunches. For studying the

longitudinal phase space properties we

have developed a microwave-cavity-based

diagnostics tool to determine the bunch

length with sub-picosecond temporal

resolution and a dedicated Wien filter to

measure the bunch energy spread with

eV resolution. The simultaneous use of

the microwave cavity and the Wien filter

will enable us to characterize the full

longitudinal phase space distribution.

This method will allow us to investigate

the effects of bunch density on the

longitudinal phase space distribution.

Imaging product-pair correlations in bi-molecular collisions

Zhi Gao, Sjoerd N. Vogels,

Sebastiaan Y.T. van de Meerakker

Molecular and Laser Physics,

Radboud University Nijmegen

Scattering processes play an important

role in astrophysics and astrochemistry.

To fully understand these processes,

we need to study molecule-molecule col-

lisions in greatest detail. In bi-molecular

collision experiments, the degrees of

freedom of both molecules couple and

therefore give rise to much more complex

dynamics than present in atom-molecule

collisions. In particular, both molecules

can get rotationally excited during the

collision event, and the experimental

study of the pair-correlated cross sections

constitutes one of the largest challenges

to improve our understanding of collision

processes between individual molecules.

We use novel experimental methods that

combine Stark decelerators and velocity

map imaging to experimentally resolve

these product pair correlations, for fully

state-selected ND3-ND3 and NO-O2

collisions.

35

P19 P20

Search for the permanent electric dipolemoment of xenon

J.O. Grasdijk3,1, S. Zimmer1,

F. Allmendinger2, W. Heil1, K. Jungmann3,

S. Karpuk1, H.J. Krausse4, A. Offenhauser4,

U. Schmidt2, Y. Sobolev1, K. Tullney1,

and L. Willmann3

1 Universität Mainz2 Universität Heidelberg3 VSI, University of Groningen4 Forschungzentrum Jülich

A permanent electric dipole moment

(EDM) implies breakdown of P (parity)

and T (time reversal) symmetries.

Provided CPT holds, this implies CP viola-

tion. Observation of an EDM at present

and near future achievable experimental

sensitivity would provide unambiguous

evidence for physics beyond the Standard

Model. This could give a hint towards

understanding the observed matter-anti-

matter asymmetry in the universe. We

aim to improve the current experimental

limit on an EDM in 129Xe (|dXe| <

3x10-27 ecm [1]) by some 4 orders of

magnitude. Our sensitive experimental

approach is a spin clock, co-located spin

polarized 3He and 129Xe. SQUID detec-

tors are used to monitor the free spin

precession of both species simultaneously.

The achievable spin coherence times and

measurement sensitivity are sufficient for

obtaining |dXe| < 10-29 ecm in one day.

[1] M. Rosenberry, T. Chupp. Phys. Rev. Lett. 86, 22-25 (2001)

Mapping the local density of states ofperiodic plasmonic nanostructures withstochastic super-resolution

Ke Guo1, Marc Verschuuren2,

Jaime Gómez Rivas3,

and Femius Koenderink4

1 FOM Institute AMOLF2 Philips Research Laboratories3 FOM Institute AMOLF,

c/o Philips Research Laboratories4 FOM Institute AMOLF

Periodic plasmonic nanostructures have

been found promising in controlling the

directivity and efficiency of solid-state

lighting devices, in particular LED-

pumped phosphors. Due to the inhomo-

geneous spatial distribution of the photo-

nic resonances of periodic plasmonic

nanostructures, their influence on the

emission is strongly dependent on the

position of emitters relative to the nano-

structures. Therefore, mapping the local

dependence of directivity and efficiency

can be a key to understand and optimize

the devices. Here we introduce a method

of mapping local directivity and efficiency

of emitters coupled to periodic nano-

structures based on stochastic super-

resolution. As an example, we show

measurements of local density of states

(LDOS) induced by a hexagonal lattice of

aluminum nanoantennas with a spatial

resolution of ~40 nm. With FDTD simu-

lation, we demonstrate that the variation

of the decay rate of the emitters in the

investigated sample is hardly influenced

by the lattice modes and mainly governed

by single-particle LDOS variations.

36

P21 P22

Structural determination of dissociationproducts of ionized N-containing PAHs

Arjen de Haas, Jos Oomens and

Jordy Bouwman

Radboud University, Institute for Molecules

and Materials, FELIX Laboratory

Nitrogen containing polycyclic aromatic

hydrocarbons (PANHs) have been hypo-

thesized to be partially responsible for the

IR emission bands observed toward many

objects in the interstellar medium. PANHs

dissociate when processed by cosmic rays,

shocks, or vacuum ultraviolet (VUV)

radiation. Here, we present first results

on an experimental study of the molecu-

lar structures of the products of HCN-

loss from two C13H9N PANHs, acridine

and phenanthridine.

The experiments have been performed on

a recently modified quadrupole ion trap

time-of-flight mass spectrometer that is

coupled to the free electron laser for

infrared experiments (FELIX). The parent

PANHs are dissociatively ionized by

means of an ArF laser and the dissocia-

tion products are trapped and subsequent-

ly mass-isolated by a tailored rf-excitation

pulse that is supplied to the ion trap

electrodes. The structure of the isolated

fragments is determined by infrared

multiphoton dissociation spectroscopy

and quantum-chemical calculations at

the density functional theory level. We

show that – in contrast with previous

computational studies – acenaphthylene

is the dominant dissociation product

of the HCN-loss of acridine and

phenanthridine.

Creating and controlling polarizationsingularities in plasmonic fields nearmultiple subwavelength holes

A. de Hoogh1, T. Visser2, N. Rotenberg1,

and L. Kuipers1

1 Center for Nanophotonics, FOM Institute

AMOLF, Science Park 104, Amsterdam,

The Netherlands, hoogh@amolf.nl

2 Department of Physics and Astronomy,

VU University, Amsterdam 1081 HV,

The Netherlands

The creation of structured light fields

that can carry angular momentum at

the nanoscale is a possible route towards

on-chip applications in areas such as

biosensing and quantum optics.In nano-

structures, regions with local angular

momentum are often associated with

optical singularities, either phase or

polarization singularities for orbital- or

spin-angular momentum, respectively.

We present the results of our search for

the simplest plasmonic system that

contains and allows us to control

polarization singularities. We find that,

dependent on the polarization of the

incident light, the light fields around

two or three subwavelength holes,

positioned in series, are enough to create

singularities. We predict where these

singularities are created, their index,

and the topology of the field surrounding

them. These results demonstrate the

promise of this plasmonic platform as

a tool for studying and controlling

fundamental properties of light fields.

37

P23 P24

Ultrastable XUV interferometry for two pulse Fourier transform lenslessimaging

G.S.M. Jansen, S. Witte, and K.S.E. Eikema

VU University Amsterdam and ARCNL

Two-pulse Fourier-transform imaging,

a technique recently developed in our

group, can provide accurate spatial and

spectral information in broadband

lensless imaging, and is therefore well

suited to extreme ultraviolet (XUV)

sources based on high-harmonic genera-

tion (HHG). Since our method relies

on precise and stable scanning of a delay

between two pulses, we developed a

common-path interferometer using

birefringence in four YVO4 wedges. It

generates the required pulse pairs with

sub-attosecond precision and a maxi-

mum delay of 50 femtoseconds. The

propagation direction between the two

pulses is adjusted by tilting the last

wedge. This separates the two pulses

spatially in the focus for HHG generation,

but leads to overlapping XUV beams in

the far field.

Starting with 10 mJ pulses (~20 fs), pairs

of 2.5 mJ pulses are produced for HHG

in argon. The generated XUV radiation

illuminates a sample, and the resulting

diffraction pattern is captured on an

EMCCD camera while scanning the

delay. From this data we retrieve the

image of the sample and the XUV

spectrum.

A hybrid atom-ion trap for Li and Yb+

J. Joger, H. Fürst, N. Ewald, T. Secker and

R. Gerritsma

Institut für Physik, Johannes Gutenberg-

Universität Mainz, Germany

A setup for realising a hybrid system of

ultra-cold atoms and ions is presented.

This will allow studying the quantum

dynamics of mixtures of fermionic atoms

and ions. Recent theoretical analysis has

shown that the time-dependent trapping

field of the ions can cause heating in

hybrid atom-ion systems. One way to

mitigate this problem is to employ

ion-atom combinations with a large mass

ratio [1]. The highest convenient mass

ratio - for species that still allow for

straightforward laser cooling - is ~29,

and is achieved by using the combination174Yb+ and 6Li. Combining ion trapping

technology with ultra-cold Li poses

particular challenges that we address

on this poster. We discuss a setup for

measuring atom-ion interactions that

involves an ancillary detection ion that

is coupled to the probe ion. An exciting

prospect is to boost the atom-ion inter-

action by coupling to Rydberg levels,

which we discuss in theory.

[1] M. Cetina et al., Phys. Rev. Lett. 109, 253201 (2012).

38

P25 P26

Rydberg system with single-site addressability

Tarun Johri, Rasmus Skannrup,

Servaas Kokkelmans, and Edgar Vredenbregt

Department of Applied Physics,

Eindhoven University of Technolog

Storing laser-cooled Rydberg atoms in latti-ces imprinted with a spatial light modulator[I] offers the possibility to simulate quan-tum processes. Since Van der Waals forcesfor Rydberg atoms are many orders of magnitude greater than those of groundstate atoms, Rydberg atoms are suitable forinducing strong correlations in such a latti-ce. Using blockade phenomena, one Rydbergatom per lattice site may be achieved if thedensity of ground-state atoms per site issufficiently large. To prepare tailored initialconfigurations, control algorithms derivedfrom operational research on wireless net-works [II] can be applied. Readout of resul-ting patterns requires single-atom detectionwith spatial resolution. So far we have been able to achieve spatialimaging of Rydberg atoms using ion opticsand incorporated in-vacuo aberration correction for imprinted light patterns.Presently, we are working on stabilisation of the Rydberg excitation laser system usingElectromagnetically Induced Transparencyand an ultra-stable reference cavity. Oncethese improvements are implemented weplan to study the statistics of Rydberg exci-tation in single lattice sites, with the aim of achieving precisely one Rydberg atom perlattice site using the Rydberg blockade. Thenext step is to create interaction betweenatoms at neighbouring sites. The grandchallenge is to create systems of interactingRydberg atoms with scalability.

I. Patterned Rydberg excitation and ionization with a spatial light modulator ; New J. Phys.17, 023045

II. Wireless Network Control of Interacting Rydberg Atoms ; Phys. Rev. Lett. 112, 163001

Protection of quantum coherence andentanglement through controlled decoherence

N. Kalb, J. Cramer, T.H. Taminiau,

and R. Hanson

QuTech and Kavli Institute of Nanoscience

Delft, Delft University of Technology,

The Netherlands

Quantum superposition states are

susceptible to decoherence due to inter-

actions with the environment. Generally,

these interactions are uncontrolled and

undesired: they cause a rapid loss of the

phase of the quantum state and the

associated information. Here we

experimentally demonstrate that adding

a strong channel of decoherence in the

form of repeated measurements can

actually protect complex quantum states

from environmental decoherence.

We create quantum states of up to three13C nuclear spins in diamond [1] and

use optical excitation of an electron spin

to repetitively project a joint observable

of the nuclear spins. This projection

freezes the unwanted evolution due to

the environment through the Quantum

Zeno effect, while leaving the remaining

degrees of freedom available to encode

protected quantum states including

entanglement. This result enables

exploring quantum computations with

multiple encoded quantum bits and

studying complex spin dynamics under

engineered decoherence.

[1] T.H. Taminiau et al., Nature Nanotech. 9, 171, 2014

39

P27 P28

The interaction between molecules and metal oxide surfaces of clusters: IR spectroscopy and DFT calculations

D.M. Kiawi1,2, J. Oomens1,2, W.J. Buma2,

N. Jamshidi4, L. Visscher4,

L.B.F.M. Waters3,2, and J.M. Bakker1

1 Radboud University Nijmegen2 University of Amsterdam3 SRON, Utrecht4 VU University Amsterdam

The interactions of metal oxide surfaces

with simple ligand molecules are impor-

tant in a diversity of areas ranging from

astronomy to (bio-) catalysis. To under-

stand the fundamental processes on

these surfaces, where the precise number

of adsorbant molecules is difficult to

establish, we study them in the form

of clusters, where this number can

unambiguously be established using

mass-spectrometric techniques. Clusters

are produced through laser vaporization

and are subsequently brought into a flow

tube-type reaction cell where molecules

can be adsorbed on the cluster surface.

By resonant vibrational excitation using

light produced by FELIX, the IR spectrum

of cluster with adsorbant can be obtai-

ned, revealing for instance the nature of

binding (molecularly or dissociatively).

Here, we present studies on the inter-

actions of oxygen molecules with alumi-

num oxide, and water with manganese

oxide as model system for the active

center in photosystem II.

M. Kiseleva1, J. Mandon1, S. Persijn2,

J. Petersen3, L. Nielsen3, and F. Harren1

1 Radboud University2 Dutch Metrology Institute3 Danish Fundamental Metrology

Spectral databases such as HITRAN and

GEISA are used in different atmospheric

and environmental applications. While

these databases contain enormous

information about line parameters, the

accuracy of the data is not very high or

sometimes even undefined. The work

presented here is part of the

EUMETRISPEC project aiming at

establishing a European high-resolution

spectroscopy infrastructure for traceable

measurements of spectral line data of

key atmospheric molecules.

For accurate line strength measurements

in methane cavity ring down spectrosco-

py technique was used known by its main

advantages – high selectivity and high

sensitivity. Due to long optical path

length of 1.5 kilometers this spectrometer

allowed to measure the values of the line

strength of the order of 10-26 cm/mole-

cule. For every spectral line 30 spectra

at 4 different pressures between 10 and

100 mbar at room temperature were

recorded. Spectra were analysed using

several line shape profiles. The uncer-

tainty budget of the obtained line

strength values is discussed.

Traceable line strength measurements in methane in the spectral region around 1.6 µm using cavity ring downspectroscopy

40

P29 P30

Sub-micron magnetic lattices for quantum simulation

A.L. La Rooij, L. Torralbo Campo,

H.B. van Linden van den Heuvell and

R.J.C. Spreeuw

Institute of Physics,

Universiteit van Amsterdam

We use nano-lithography techniques to

create lattice potentials in permanent

magnetic films on atom chips, trapping

clouds of 1-1000 ultracold atoms per

lattice site. This technique allows for a

wide variety of geometries, over a large

range of length scales. Using e-beam

lithography, we are downscaling the

lattice spacing from our current 10um

to lattice spacing varying from 250nm up

to 5um on the same chip. For a new

series of experiments, we designed new

structures including new Kagome and

hexagonal geometries, designed defects

and disorder, fence-type potential bar-

riers, and tapered lattices. These will be

used in future experiments to study

the role of disorder, frustration and

dimensionality.

Coupling ultracold atoms to nanophotonic membrane structures

A.J. van Lange, B.O. Mussmann, S. Pratama,

and D. van Oosten

Debye Institute for NanoMaterials Science

and Center for Extreme Matter and

Emergent Phenomena, Utrecht University

We position ultracold rubidium atoms

near a silicon nitride membrane and

study their interaction with the

evanescent field of the waveguide mode

in the membrane. The atoms are cooled

to 100 microkelvin and precisely placed

using a series of movable optical traps.

As the distance between atoms and mem-

brane is only a few hundred nanometers,

atoms protrude into the evanescent field

and thus interact with the waveguide

mode. To study this interaction, we cou-

ple light into and out of the membrane

using surface grating couplers and

monitor the transmission of the wave-

guide as a function of the proximity of

the atoms. These experiments open up

new opportunities to study the inter-

action between ultracold atoms and

light confined on the nanoscale.

Example of a magnetic lattice potential, fenced in by apotential barrier on two sides.

41

P31 P32

Optical manipulation of Sodium BECs

G. Li, J. Smits, and P. v.d. Straten

Debye Institute, Utrecht University,

Utrecht, The Netherlands

Axcitations in degenerated quantum

gases have been produced using different

methods, i.e. by moving a laser beam

through the atom cloud or using stirring

techniques to create optical vortex latti-

ces. However, most methods provide little

control over the exact type of excitation

produced. We will present two ways in

which the atom cloud will be excited. We

will study the hydrodynamic behavior of

the BEC by moving it with velocities

above the speed of sound into a potential

barrier created by a focused blue-detuned

laser. When the relative velocity is below

a certain critical velocity, no excitations

are produced, but above the speed of

sound wakes will form. These wakes will

be studied. We also present a novel way

to create precise patterns of vortices.

Using a LCoS SLM we plan to imprint

vortices and other exotic phase patterns

on the BEC using stimulated Raman

adiabatic passage. We present simulations

of the dynamics after the atoms have

been excited.

Rydberg excitation and dressing on an atom chip

G. Lochead, N. Cisternas,

J.J.M. de Hond, R.J.C. Spreeuw,

H.B. van Linden van den Heuvell,

and N.J. van Druten

IoP/WZI, Universiteit van Amsterdam (UvA)

Atom chips offer unique opportunities

to study quantum-degenerate gases. In

particular, it is straightforward to produce

highly elongated Bose-Einstein conden-

sates. One of the challenges is to create

tunable interactions. An appealing

approach is to use Rydberg-mediated

interactions to create strong, long-range,

tunable, and switchable interactions.

We are exploring Rydberg excitation in

the Celsius atom chip setup at UvA. The

Rydberg character can be added either

via direct excitation or by dressing.

Advantages of dressing are that the decay

is slower and that it provides a tuning

knob for the interaction strength. In our

trapping geometry, the Rydberg blockade

radius is larger than the radial size, so

that we can study effects such as adiabatic

crystal formation in a one-dimensional

system without order. We have set up the

lasers for two-photon excitation of 87Rb

condensates, and are now characterizing

the system. We simulate the effect of

Rydberg dressing in our clouds using a

numerical 3D GPE solver.

42

P33 P34

Optical tuning and read-out of spin dynamics for triplet excitons inorganic molecules

G.J.J. Lof1,2, R.W.A. Havenith2,4,5,

R. Broer2, M.A. Loi3, C.H. van der Wal11 Physics of Nanodevices group2 Theoretical Chemistry3 Photophysics and OptoElectronics;

Zernike Institute for Advanced Materials, University of Groningen, The Netherlands

4 Stratingh Institute for Chemistry, University of Groningen, The Netherlands

5 Ghent Quantum Chemistry Group; Department of Inorganic and Physical Chemistry, Ghent University, Belgium

Due to their chemical tunability, low-costand ease of processing, organic moleculesare often used for opto-electronic devicessuch as organic solar cells and LEDs. Insuch devices, the ratio of singlet to tripletexcitons can be an important performanceparameter. Transitions from the singletground state to triplet exciton states canbecome optically allowed in molecules exhi-biting strong spin-orbit coupling (Fig. 1). We investigate the possibility of demonstra-ting and exploiting correlations betweenlight polarization and exciton triplet spinpolarization in organic molecules. Besidesthe fundamental interest, this could developinto applications in the field of spintronicsor into a novel tool for characterizing organic opto-electronic devices.

Transition metal oxide cluster magnetism: a FexOy

0/+ case study

R. Logemann, G.A. de Wijs, A.N. Rudenko,

M.I. Katsnelson, and A. Kirilyuk

Radboud University, Institute for Molecules

and Materials, 6525 AJ Nijmegen,

The Netherlands

We theoretically consider gas-phase

FexOy+/0 clusters using Density

Functional Theory (DFT), aiming to

obtain a detailed understanding of the

relation between the geometry, electronic

structure and magnetic state of these

clusters.

To determine the possible geometric

structures, we combine a genetic algo-

rithm with DFT. To validate our geometric

structures we compare the calculated

vibration spectra with the experimentally

measured infrared multiphoton dissocia-

tion spectra.

To understand the electronic structure we

study the cluster valence configuration.

While some clusters are pure trivalent,

we also show mixed valence results.

Furthermore, we show how the local den-

sity of states significantly differs between

divalent and trivalent Fe, despite the very

different atomic environment in clusters

and bulk magnetite.

Finally, we also calculate the exchange

interactions using both a total energy

approach and a method based on multi-

ple scattering theory. We will show the

recent progress in calculation of these

exchange interactions and will compare

the two methods for iron oxide clusters.

Fig. 1: Jablonski diagram with ground state and excitoniclevels of an organic molecule in a magnetic field, withsemi-classical representation of the spin configuration for the S0, S1 singlet states and the three T1 triplet states.This research aims at direct optical study of spin dynamicsof the T1 states, in molecules where the S0-T1 transition is allowed due to strong spin-orbit coupling.

43

P35 P36

A quantum platform using Rydbergatoms in magnetic lattices

S. Machluf, J. Naber, L. Torralbo-Campo,

M.L. Soudijn, A.L. La Rooij, D. Davtyan,

H.B. Van Linden Van Den Heuvell,

N.J. Van Druten, and R.J.C. Spreeuw

Institute of Physics, University of Amsterdam

We present our latest results with atomic

ensembles in a two-dimensional array

of micro-traps created by a permanently

magnetized atom chip, which is a scala-

ble platform for quantum information

and quantum simulations.

We present results on the interactions

between Rydberg atoms and the atom

chip surface, which are most likely

induced by electric fields from rubidium

adsorbates and free electrons/ions on

the surface.

In parallel, we are downscaling the lattice

spacing to length scales well-bellow

optical lattices, opening up a new type

of quantum simulators with Hubbard

type models.

QCL-based sensors for exhaled CO analysis

J. Mandon, N. Pakmanesh, F.J.M. Harren,

and S.M. Cristescu

Life Science Trace Gas Facility,

Radboud University, Nijmegen, NL

Exhaled Carbon Monoxide (eCO) is

an important biomarker as it originates

in the human body from the heme

(component of hemoglobin) degradation.

eCO measurements with high sensitivity,

precision and accuracy remains

challenging.

The aim of this study is to investigate

different optical spectroscopic methods.

Based on a Quantum Cascade laser

emitting at 4.61µm, Off-Axis Integrated

Cavity Output Spectroscopy (OA-ICOS)

and Wavelength Modulation 2f/1f

Spectroscopy (WMS-2f/1f) methods

have been developed. Offering ppbv

(part-per-billion by volume) detection

limits, both setups are facing different

limitations. The data analysis validating

the advantages and efficiency of laser-

based sensors for eCO measurements

(e.g. the accuracy, precision, sensitivity,

time resolution and reproducibility) are

presented.

Figure: Absorption lines of 87Rb 23d5/2 Rydberg state nearthe atom chip surface for different applied electric fields.

44

P37 P38

Deceleration, cooling and trapping ofSrF molecules for precision spectroscopy

S.C. Mathavan1, J.E. van den Berg1,

R. Hoekstra2, K. Jungmann1, C. Meinema1,

A. Zapara1, and S. Hoekstra1

1 Van Swinderen Institute2 Zernike Institute for Advanced Materials

Heavy diatomic molecules can have

hugely enhanced sensitivity for the study

of fundamental interactions and

symmetries, such as the search for an

electron-EDM or parity violation. We

work on the development of methods

to decelerate, cool and trap selected

diatomic molecules suited for precision

measurements, to exploit the long

coherence time offered by cold, trapped

molecules.

Traditional stark decelerators are ineffi-

cient for the deceleration of heavy

diatomics such as SrF, due to instabilities.

We have built a 4 meter long traveling-

wave decelerator in our lab for the

deceleration of heavy diatomics, which

is inherently stable. Following the

deceleration, we will laser cool and trap

the molecules to prepare them for a

parity violation measurement.

We present the current status of the

experiment and present the results on

the deceleration of SrF molecules using a

4 meter long traveling-wave decelerator.

Measurement of the 5d2D5/2 state lifetime in single trapped Ba+ ion

Amita Mohanty, Elwin A. Dijck,

Mayerlin Nuñez Portela, Nivedya Valappol,

Andrew T. Grier, Klaus Jungmann,

and Lorenz Willmann

Van Swinderen Institute, University of

Groningen, The Netherlands

The lifetime of the metastable 5d2D5/2

state in Ba+ is an important parameter

for verifying the atomic wavefunctions,

which are needed in precise measure-

ments of Atomic Parity Violation (APV)

for extracting the Weinberg angle.

Wavefunctions can be tested at a percent

level accuracy. For this, a single trapped

Ba+ ion is investigated and the 5d2D5/2

state lifetime is determined by the elec-

tron shelving method. Such a precision

experiment is highly sensitive to any

effects that determine the long term

performance of the experiment (i.e.

several hours to days). Systematic uncer-

tainties such as interactions of the ion

with background gas etc. are investigated.

A single trapped Ba+ ion is used as

precursor to Ra+.

45

P39 P40

Atomic parity violation in single trappedion via light shifts

Amita Mohanty, Elwin A. Dijck,

Mayerlin Nuñez Portela, Nivedya Valappol,

Andrew T. Grier, Klaus Jungmann,

and Lorenz Willmann

Van Swinderen Institute, University of

Groningen, The Netherlands

Aight shifts permit the mapping of

weak interaction effects onto the energy

splitting of the magnetic sublevels in Ra+.

A precise measurement of Atomic Parity

Violation (APV) provides for the deter-

mination of the weak mixing angle

(sin2 ΘW), the Standard Model para-

meter which connects the electromagnetic

with the weak interactions. APV is parti-

cularly sensitive to light dark Z bosons

with masses below a few 100 MeV. For

performing such an experiment, localiza-

tion of a single ion within a fraction of

an optical wavelength in two orthogonal

light fields of known polarization is

required to disentangle the electro-

magnetic and weak contributions to the

light shift. The heavy alkaline earth ion

Ra+ is very well suited for such experi-

ments because the APV signal scales

significantly stronger than with Z3.

Ba+ serves as a precursor and precise

light shift determination in the

6s2S1/2-5d2D3/2 transition is the

next step towards the Ra+ ion APV

experiment in this project.

New ray tracing simulation method forthe modelling of reinjection cavities inOA-ICOS and CRDS

F. Nadeem, S. Hageraats, J. Mandon,

S.M. Cristescu, and F.J.M. Harren

Institute for Molecules and Materials,

Radboud University Nijmegen

For correspondence: f.nadeem@science.ru.nl

A newly developed ray tracing model is

reported, aimed at simulating reinjection

cavities as a means to enhance sensitivity

in off-axis integrated output spectroscopy

(OA-ICOS) and cavity ring-down

spectroscopy (CRDS). The model,

based on three-dimensional ray tracing

matrix analysis, predicts output power

enhancement factors of up to 63,

significantly higher than previously

reported [1,2].

[1] R. Centeno et al., Opt. Express, 22, 23, 27985-27991, 2014

[2] A. O’Keefe and J. B. Leen, Rev. Sci. Instrum., 85, 9, no. 093101, 2014

46

P41 P42

F. Nadeem1, D. Mundy2, S. Hageraats1,

J. Mandon1, S.M. Cristescu1,

and F.J.M. Harren1

1 Institute for Molecules and Materials,

Radboud University Nijmegen,

the Netherlands 2 M Squared Lasers LTD, Glasgow, Scotland,

United Kingdom

For correspondence: f.nadeem@science.ru.nl

EC-QCLs provide access to the broad

spectral range of QCLs allowing high

resolution absorption spectroscopy

measurements. We have developed two

widely tunable, EC-QCLs, one in pulsed

mode and one in Continuous Wave

(CW) mode, in Littrow configuration.

The CW laser has a tuning range of

213 cm-1 and operates between 1160

and 1375 cm-1 with ~14 mW of output

power at 243 K. The pulsed mode laser

has a tuning range of 150 cm-1 and

operates between 1210 cm-1 and

1360 cm-1 at temperatures above 278K.

The systems are used in various con-

figurations to provide on-line detection

of Volatile Organic Compounds.

Optical trace gas detection in humanbreath for disease diagnosis

M. Azhar1, A.H. Neerincx1, J. Mandon1,

S.M. Cristescu1, M. Boerkamp2, J. Mink2,

and F.J.M. Harren1

1 Radboud University, Nijmegen2 VTec Lasers and Sensors, Eindhoven

A portable, low cost optical spectrometer

has been developed for hydrogen cyanide

(HCN) detection in human breath. HCN

in exhaled breath has been proposed as a

marker for Pseudomonas aeruginosa (PA)

infection in cystic fibrosis (CF) patients.

This system is primarily intended to be

a non-invasive diagnostic test for

respiratory infection with PA.

A simple off-axis Integrated Cavity

Output Spectroscopy setup is used and

a telecom laser operating around 1.5

microns is used to probe the HCN

spectra. Detection sensitivities of <5 ppbv

for 1-100 seconds acquisition times have

been obtained. The sensitivity of the

system has allowed the monitoring of

HCN concentrations in breath samples

of infected patients.

Applications of widely tunable external

cavity quantum cascade lasers (EC-QCLs)

in continuous wave and pulsed mode

Figure. Allan variance of acquired calibration data showsthe detection limits at various acquisition times.

47

P43 P44

Measuring the 2 3S → 2 1S transition inmetastable helium using a narrow linewidth 1557-nm laser

R.P.M.J.W. Notermans, R.J. Rengelink,

and W. Vassen

LaserLaB, Department of Physics and

Astronomy, VU University Amsterdam

We have previously measured the

doubly forbidden 2 3S → 2 1S transition

at 1557 nm (natural linewidth 2π × 8 Hz)

to a few kHz precision in both 3He and4He. The results were combined with

QED calculations to determine the 3He-4He nuclear charge radius difference

with 1.1% accuracy. A similar recent

determination shows a disagreement of

4σ with our result. New measurements

in the muonic helium ion are in progress

that aim to achieve a precision of

3 × 10-4.

To achieve a similar precision, we will

remeasure the 2 3S → 2 1S transition to

sub-kHz precision (goal: 5 × 10-13 relative

accuracy). One major improvement is the

linewidth narrowing of the spectroscopy

laser from 90 kHz to ~1 kHz using a

transfer lock to an ultrastable laser

(linewidth < 2 Hz). We will enter the

regime where the lineshape is determined

by the different particle statistics between

fermionic 3He and bosonic 4He.

Acoustooptical measurement of ultrasonic resonances in microfluidicchannels

Jorick van ‘t Oever1,2, Raymond Frentrop2,

Herman Offerhaus2, Dirk van den Ende1,

Jennifer Herek2, and Frieder Mugele1

1 Physics of Complex Fluids,

University of Twente 2 Optical Sciences, University of Twente

Acoustics are used in many Lab-on-a-

Chip (LoC) applications, such as mixing

and non-contact particle manipulation

like particle concentration, trapping and

droplet merging. The strongest effects are

achieved using resonances, providing

high acoustic pressures. On this poster,

we present a method for determining the

spatially resolved acoustic field inside a

water-filled microchannel. The acoustic

field, both amplitude and phase, is deter-

mined by measuring the change of index

of refraction of the water due to the local

pressure using stroboscopic illumination.

The pressure fields are measured for the

fundamental resonance in the water-filled

microchannel and two higher harmonic

modes. By combining measurement at a

range of excitation frequencies a frequen-

cy map of modes is made, from which

the spectral line width and Q-factor of

individual resonances can be obtained.

These results are used to develop a fast

and simple sensor that measures the

ultrasonic pressure in a LoC-device for

particle concentration. Another applica-

tion of our technique is to measure the

local acoustic field around immersed

objects for the study of acoustic scattering

and particle-particle interaction.

48

P45 P46

Towards a strontium quantum gasmicroscope

Oleksiy Onishchenko,

Georgios A. Siviloglou, and Florian Schreck

Van der Waals-Zeeman Institute, Institute of

Physics, University of Amsterdam

The realization of quantum gas microscopes for bosonic [1-2] and fermionic [3-5] alkaliatoms led to the observation and manipulation ofstrongly-correlated systems at the single-atomlevel in an optical lattice. It has opened a path forprobing the physics of the Hubbard model with unprecedented precision. We are building a quantum gas microscope for strontium. The structure of the fermionic iso-tope of this alkaline-earth element comprises anarrow intercombination line, an ultra-narrowclock transition, metastable excited states, and alarge number (N=10) of collisionally-stableSU(N)-symmetric nuclear spin states [6]. Theseproperties are at the core of new paths to artificialgauge fields [7], the creation of 4D lattices [8], or the exploration of SU(N) orbital magnetism [9].

[1] W. S. Bakr et al., Nature 462, 74 (2009).[2] J. F. Sherson et al., Nature 467, 68 (2010).[3] E. Haller et al., arXiv:1503.02005 (2015).[4] L. W. Cheuk et al., Phys. Rev. Lett. 114, 193001

(2015).[5] M. F. Parsons et al., Phys. Rev. Lett. 114, 213002

(2015).[6] S. Stellmer, R. Grimm, and F. Schreck, Phys.

Rev. A 87, 013611 (2013).[7] N. R. Cooper, Phys. Rev. Lett. 106, 175301 (2011).[8] O. Boada, A. Celi, J. I. Latorre, and M. Lewenstein,

Phys. Rev. Lett. 108, 133001 (2012).[9] A. V. Gorshkov et al., A. M. Rey, Nat. Phys. 6,

289 (2010).

Angle-resolved cathodoluminescenceimaging polarimetry

Clara I. Osorio, Toon Coenen,

Benjamin Brenny, Albert Polman,

and A. Femius Koenderink

Center for Nanophotonics,

FOM Institute AMOLF

Cathodoluminescence spectroscopy (CL)

allows characterizing bulk and nano-

structured materials by measuring the

light emitted in response to their inter-

action with a beam of energetic electrons.

While previous CL measurements focused

on the spectral content and angular

distribution of emission, here we

demonstrate a technique to access the

full polarization as a function of the

emission angle. Using this technique,

we measure the emission of metallic

bullseyes nanostructures and show that

nanoscale changes in excitation position

induce large changes in polarization

ellipticity and helicity. Furthermore, by

exploiting the ability of polarimetry to

distinguish coherent and incoherent

radiation, we quantify the contributions

of different types of radiation to the

emission of a gold surface, silicon and

gallium arsenide bulk semiconductors.

This technique paves the way for in-depth

analysis of the emission mechanisms

of nanostructured devices as well as

macroscopic media.

49

P47 P48

Asymmetric transmission and opticalactivity in chiral photonic crystals

N. Parappurath, L. Kuipers and E. Verhagen

FOM Institute AMOLF, Amsterdam,

The Netherlands

New nanostructures that strongly affect

the direction and polarization of light can

enable extremely small optical devices.

Specifically, chiral nanostructures provide

unique functionality in this regard. So

far, most of the efforts to realize strong

chirality in thin structured media have

employed either plasmonic metamaterials

or single-layer planar chiral structures.

These structures have a high degree of

symmetry in the vertical direction, such

that they show only limited asymmetric

transmission for linearly polarized light.

In this work, we propose the design for a

strongly chiral bilayer dielectric photonic

crystal (CPC). Simulations show that the

structure offers a large difference in

transmittance for opposite directions of

incidence, for circular as well as linearly

polarized light. The proposed CPC shows

strong optical rotation. Eigenfrequency

calculations of the system are employed

to investigate the origin of the

asymmetric response.

Bose-Einstein condensation of photons

K. Perrier, S. Greveling and D. van Oosten

Debye Institute for NanoMaterials Science and

Center for Extreme Matter and Emergent

Phenomena, Utrecht University

In 2010 the first Bose-Einstein conden-

sate of photons was achieved using a

dye-filled microcavity by Klaers et al. [1].

In this setup is a harmonic potential for

the photon gas was realized and the

coupling to the dye gave rise to

thermalization. It is our goal to achieve

Bose-Einstein condensation of photons

in a periodic potential. To this end, we

must first reproduce Bose-Einstein

condensation of photons under the

conditions used in the group of Martin

Weitz. On our poster we will discuss the

setup of the dye-filled microcavity, the

results, and provide an outlook as to how

to achieve a periodic harmonic potential.

[1] J. Klaers, J. Schmitt, F. Vewinger, and M. Weitz, "Bose-Einstein condensation of photons in an optical microcavity", Nature 468, 545 (2010)

Cavity top Cavity front

50

P49 P50

Gas-Phase spectroscopy inside a freeelectron laser cavity: Ionization andinfrared spectra of hydrocarbon species

A. Petrignani1,2, J. Eyler3, G. Berden2,

B. Redlich2, A.F.G. van der Meer2, M.T. Vala3,

A.G.G.M. Tielens1, and J. Oomens2

1 Leiden Observatory, Leiden University 2 FELIX Laboratory, Radboud University3 Department of Chemistry,

University of Florida

Polycyclic Aromatic Hydrocarbon (PAH)

species are the most dominant complex

molecules in interstellar space and

responsible for the Aromatic Infrared

Bands. In the harsh interstellar environ-

ments, many PAHs are expected to be

ionized and/or fragmented by UV

radiation. Though only the most stable

PAHs are expected to survive, the

ionization/fragmentation processes may

possibly produce common fragments

acting as stable intermediates in the

breakdown chemistry of PAHs. We

present gas-phase spectroscopy of PAHs

and their ion products. We performed

multiple photon dissociation (IRMPD)

spectroscopy inside the cavity of the free

electron laser FELICE, thus allowing

for IRMPD of very stable (difficult to

dissociate) species. We recorded the gas-

phase IR spectrum of the phenyl cation

and investigated the product fragments

in the ionization of the three 3-ring

PAHs, fluorene, dihydroanthracene, and

dihydrophenanthrene, demonstrating the

production of the common ion fragment,

fluorenyl.

Accurate time and frequency distribution over a 2×137 km optical fiber link

T.J. Pinkert1, E.F. Dierikx2, H.Z. Peek3,

R. Smets4, and J.C.J. Koelemeij5

1 LaserLaB, Department of Physics and

Astronomy, VU University Amsterdam,2 VSL, Delft3 Nikhef, Amsterdam4 SURFnet, Utrecht5 OPNT B.V., Amsterdam

We report on a fibre-optic link connec-

ting Nikhef Amsterdam and VSL Delft,

realised through 2×137 km of SURFnet

fiber, targeted at dissemination of the

SI second with sub-nanosecond accuracy.

The link employs White Rabbit (WR)

technology developed at CERN, which

integrates time and frequency informa-

tion into Gigabit Ethernet. Bidirectional

optical transmission using wavelengths

outside the C-band ensures compatibility

with existing telecommunication systems,

while bidirectional optical amplifiers are

used to extend the range of WR from

10 km to over 100 km. Time offsets of a

few nanoseconds are observed, limited

by the unknown delay asymmetry due

to chromatic dispersion. The stability

surpasses and the accuracy is on par with

Global Navigation Satellite Systems. We

present schemes to deal with chromatic

dispersion, and new methods for calibra-

tion of equipment delays based on signal

cross correlation. These methods enable

sub-100 femtosecond precision in the

measurement of both optical and electri-

cal delays.

51

P51 P52

Controlling disorder with periodicallymodulated interactions

M. Plodzien1,2, A. Kosior, J. Major,

and J. Zakrzewski1 Marian Smoluchowski Institute of Physics,

Jagiellonian University, Kraków, Poland2 Department of Applied Physics, Eindhoven

University of Technology, Eindhoven,

The Netherlands

We investigate a celebrated problem of

one dimensional tight binding model

in the presence of disorder leading to

Anderson localization from a novel

perspective. A binary disorder is assumed

to be created by immobile heavy particles

for the motion of the lighter, mobile

species in the limit of no interaction

between mobile particles. Fast periodic

modulations of interspecies interactions

allow us to produce an effective model

with small diagonal and large off-

diagonal disorder unexplored in cold

atoms experiments. We present an

expression for an approximate Anderson

localization length and verify the

existence of the well known extended

resonant mode and analyze the influence

of nonzero next-nearest neighbor hop-

ping terms. We point out that periodic

modulation of interaction allow disorder

to work as a tunable band-pass filter for

momenta.

Numerical investigation of strain-opticdevices based on surface acoustic wavesand buried waveguides

M.A.G. Porcel1, M. Hoekman2, M. Dekkers3,

R. Stoffer4, R. Dekker5,A. Leinse2,

P.J.M. van der Slot1, and K.J. Boller1

1 Laser Physics Nonlinear Optics, University

of Twente, TNW, MESA+ Institute for

Nanotechnology, Enschede, Netherlands2 Lionix BV, Enschede, Netherlands3 Phoenix BV, Enschede, Netherlands4 Xiophotonics, Enschede, Netherlands5 Solmates, Enschede, Netherlands

We show numerically that strain-optic

devices are possible in buried silicon

nitride optical waveguides in silica by

surface acoustic waves (SAW) generated

by a thin piezoelectric film. We compare

the different electrode geometries and

select one that can generate sufficient

refractive index change. For a functional,

feasible device we numerically calculate

the time necessary for the driving RF

signal to generate a SAW until the strain

reaches the buried waveguide. This can be

of use in a Mach Zehnder interferometer

configuration for light switching and

modulation.

´

52

P53 P54

An efficient boundary element methodfor light-matter interaction in stratifiedbackgrounds

S. Pratama and D. van Oosten

Debye Institute for NanoMaterials Science

and Center for Extreme Matter and Emergent

Phenomena, Utrecht University

Recent advances in nano-optics elicit

a growing need for more efficient

numerical treatments of light scattering

in planarly-layered media. While known

for its many favorable properties, usage

of the boundary element method (BEM)

is hindered by numerical difficulties

associated with the layered-medium

Green's functions. We present an

efficient and versatile implementation

of this approach, addressing the limiting

issues. Semi-analytical treatments of the

singularities in the integral equations

allow for arbitrary positioning of the

scatterers, thus encompassing various

relevant situations. Inclusion of arbitra-

rily many layers in the background

medium is also facilitated through

recursive evaluation of the Green's func-

tions. Further, the severe computational

cost of a naive implementation of this

method is dramatically reduced via a

simple and robustly-devised, inter-

polation scheme. We will demonstrate the

accuracy and versatility of this method by

treating several representative plasmonic

problems.

A UV-IR two colour optical dipole trapfor magic wavelength trapping of ultracold metastable helium

Bob Rengelink, Remy Notermans,

and Wim Vassen

LaserLaB, Department of Physics and

Astronomy, VU University, Amsterdam

Precision spectroscopy on the doubly

forbidden 23S→21S transition in helium

allows a determination of the 3He-4He

nuclear charge radius difference [1],

contributing to solving the proton size

puzzle. A crucial improvement for achie-

ving sufficient accuracy is a magic wave-

length optical dipole trap, which cancels

the experimental uncertainty caused by

the Stark shift.

We have built a laser system producing

over 2W of narrowband ultraviolet light

at the most promising magic wavelength

(319.815nm [2]). As a first step towards

spectroscopy, we are now trapping a 4He

Bose-Einstein condensate in a two-colour

(UV and infrared) optical dipole trap.

[1] R. van Rooij et. al. Science 333, 196 (2011)[2] R.P.M.J.W. Notermans et. al. Pys. Rev. A 90,

052508 (2014)

53

P55 P56

Ultrafast experiments in a versatileSEM-based setup

Jasper van Rens, Wouter Verhoeven,

Peter Mutsaers, and Jom Luiten

Group Coherence & Quantum Technology

Eindhoven University of Technology

P.O. Box 513, 5600 MB, Netherlands

We are developing microwave cavities

to chop a low-emittance electron beam

into 100 fs bunches at a repetition rate

of 3 GHz. Accurately synchronized to a

mode-locked laser, these bunches can be

used for ultrafast time-resolved TEM [1].

At our TU/e lab, we have tilted a

SEM-column horizontally, which allows

various ultrafast experiments that require

a longer beam line than possible in a

TEM.

Our setup allows the study of pondero-

motive scattering of electron bunches

off a standing wave of high intensity

laser light. We have already achieved the

spatial and temporal overlap of two 30-fs

laser pulses. If successful, we plan to

study diffraction of electrons on a

standing wave of light, the so-called

Kapitza-Dirac effect.

A second plan is to implement an

additional ‘streak’ RF-cavity to perform

time-of-flight femtosecond electron

energy loss spectroscopy (ToF-FEELS).

We have achieved phase control of both

cavities running simultaneously already.

[1] See poster #: W. Verhoeven, Ultrafast Time-resolvedElectron Microscopy

Lasing in plasmonic periodic, aperiodic,and disordered systems

Hinke Schokker, Clara I. Osorio,

and A. Femius Koenderink

Center for Nanophotonics, FOM Institute

AMOLF, Amsterdam, The Netherlands

We report room-temperature lasing in

two-dimensional diffractive lattices of

plasmon particle arrays embedded in a dye-

doped polymer that acts both as waveguide

and gain medium. As compared to conven-

tional dielectric distributed feedback (DFB)

lasers, the underlying band structure is

modified by both the much stronger scatte-

ring and the disadvantageous loss of metal.

In particular, the large stop gap in periodic

lattices indicates robustness against disor-

der, which we prove by showing lasing

even when removing as many as 98% of

particles and shifting them by as much as

a quarter of the periodicity. To quantify

the transition from DFB to random lasing,

we analyze the intensity statistics and

real-space autocorrelations of laser output,

using tools borrowed from speckle analysis.

Furthermore, we study lasing as function

of spatial correlation order parameter in

a suite of quasiperiodic, aperiodic and

random systems, ranging from Fibonacci

to Thue-Morse and Rudin-Shapiro lattices.

54

P57 P58

Quantum transitions in Rydberg crystals

R. U. Skannrup and S.J.J.M.F. Kokkelmans

Eindhoven University of Technology,

Eindhoven, Netherlands

We explore the dynamics of ultra coldRydberg gases. In such a gas, the excitedatoms show large van der Waals inter-actions, leading to a blockade radius Rb,within which the energy levels of nearbyunexcited atoms in the gas shift. The remai-ning atoms are therefore effectively blockedfrom entering the Rydberg regime, withinthe blockade radius Rb, as they are no longer resonant with the excitation laser. As a result, the gas will fill with Rydbergatoms that can not be arbitrarily close together. As the gas saturates, the Rydbergatoms will form crystals due to their mutually exclusive nature. The system exhibits very rich behaviour. Key properties of the physical system scalesas powers of the pricipal quantum number nof the excited state. Eg the Van der Waalscoefficient scales as n11 and the life timescales as n3. This leads to an entire zoo ofphenomena in the electronic structure ofthe crystal. Preliminary results show featuresin the energy spectrum that scale with theinterionic distance. We observe local andglobal symmetries in the wave functions. From first principles, we seek to describe the transition to strongly coupled plasmas,where the interaction energy dominates the kinetic energy. Rydberg crystals, withinthe frozen gas approximation, are ideal forstudying these transitions because of thestrong interactions and ordered crystalstructure. A thorough description of the gas and howto manipulate it has possible applications as the systems can be used as quantumsimulators or in mixed state computing.

Contact: r.u.skannrup@tue.nl

Magnetic lattice on a chip for quantumsimulation with Rydberg superatoms

Maarten L. Soudijn, J.B. Naber, S. Machluf,

L. Torralbo-Campo, A.L. La Rooij,

D. Davtyan, N.J. van Druten,

H.B. van Linden van den Heuvell,

and R.J.C. Spreeuw

IoP - University of Amsterdam

Using a permanent magnetic-film atom

chip we load clouds of ultracold 87Rb

atoms in a lattice of microtraps (figure).

The sites are spaced 10 µm apart and

contain tens to hundreds of atoms each

with temperatures of ~10 µK. We aim

to develop this system of magnetically

trapped atomic ensembles as a scalable

platform for quantum information and

quantum simulation science by using

long-range dipole-dipole interactions

between Rydberg atoms. We present

experiments driving two-photon Rydberg

excitations at various distances from the

chip surface. In addition we are studying

the coherence properties of our system by

driving the two-photon qubit transitions

in the 87Rb ground state using MW+RF

fields.

55

P59 P60

Weak link and Faraday wave experiments in a ultra-cold Bose gas

K.C. Sponselee, A.T. Vermeulen,

and P. van der Straten

Nanophotonics, Debye Institute,

Universiteit Utrecht

TA spatial light modulator (SLM) is used

to shape and control the light field in

combination with a blue-detuned laser.

Arbitrary repulsive light potentials can

in this way be made. Three experiments

are performed on a Bose-Einstein

Condensate (BEC) of sodium atoms.

The first experiment entails splitting a

BEC with a thin line focus. The light is

switched off and an interference pattern

is observed as the two BECs expand. For

the second experiment the line focus is

given a small hole. This provides a large

potential barrier with a small gap.

Transport properties through such a weak

link are studied. Faraday waves are gene-

rated by shining two sharp end caps on

the BEC. These are then moved to and

away from each other to generate density

waves.

Gerrit W. Steen1,2, Elmar C. Fuchs1,

Adam D. Wexler1, and Herman L. Offerhaus2

1 Wetsus, European Centre of Excellence for

Sustainable water Technology2 University of Twente

The effects of dissolved salts were

investigated in the wavelength range

from 14000 to 9091 wavenumbers by

a novel fitting strategy applied to

differential absorbance spectra (Fig. 1.

[1]). This strategy involves the parametric

comparison of four Gaussian curves

required to fit the absorbance spectrum

of demineralized water and an electrolyte.

A narrow bandwidth (10754 – 9618

wavenumbers) sensor can be created

using truth tables resulting from this

method.

[1] G.W. Steen, E.C. Fuchs, A.D. Wexler, H.L. Offerhaus,Identification and quantification of 16 inorganic ions in water by Gaussian curve fitting of Near-Infrared difference absorbance spectra, Applied Optics, 2015 in press

Gaussian curve fitting of Near-Infrareddifferential absorbance spectra for identification and quantification of electrolytes

Figure 1: Differential absorbance spectra

56

P61 P62

Quasi-phase matching high harmonicgeneration in a density modulated argoncluster jet

Y. Tao, S.J. Goh, P.J.M. van der Slot,

H.J.M. Bastiaens, and K.J. Boller

Laser Physics and Nonlinear Optics group,

MESA+ Institute for Nanotechnology,

University of Twente, Enschede, 7500AE,

The Netherlands

We investigate the possibility to generate

high harmonic radiation down to 20 nm

in a density modulated argon cluster jet.

To generate the clusters, we employ a

supersonic nozzle operating at high

backing pressure. The modulation of

the cluster jet serves for quasi-phase

matching the harmonic generation and

is obtained by placing an array of wires

on top of the exit of the nozzle.

Here we report on the characterization

of the harmonic radiation generated

from the cluster jet. The dependence of

the harmonic beam energy and spectrum

on the backing pressure and focusing

geometry is measured. We compare the

results for harmonic generation with or

without the array of wires on top of

the nozzle to identify the influence of

quasi-phase matching. Furthermore, we

study the optimization of the density

modulation to achieve largest enhance-

ment for the high harmonic orders.

Increasing the information content ofphotons

T.B.H. Tentrup, T. Hummel, A.P. Mosk,

and P.W.H. Pinkse

MESA+ Institute for Nanotechnology,

Universiteit Twente

The most common way to encode infor-

mation in single photons is the use of

polarization, which allows a maximum

content of 1 bit per photon. Encoding in

a higher dimensional Hilbert space allows

to add more information per photon.

Examples of encoding methods are time

binning or the use of orbital angular

momentum states. We are interested

in using the spatial position of single

photons to increase the amount of infor-

mation per photon. We use a spatial light

modulator (SLM) to control the spatial

position of the photons. Exploiting

improvements in two-dimensional

photon counting imaging systems, we

detect their (x,y) positions and discuss

the limit on information density. One

possible application of this work is

Quantum Key Distribution (QKD),

where an increase in information per

photon not only increases the possible

key generation rate but also the security

of the protocol.

57

P63 P64

Light propagation in mirror-symmetricrandom media

Ravitej Uppu, Evangelos Marakis,

and Pepijn W.H. Pinkse

MESA+ Institute for Nanotechnology,

University of Twente

Photonic crystals are nanostructured

dielectric media comprised of regularly

arranged scatterers in a Bravais lattice. In

contrast, completely random arrangement

of the scatterers gives rise to interesting

mesoscopic phenomena such as Anderson

localization. Here, we explore the effect

on the transmittance when a mirror-

symmetry is enforced on the disorder

configuration in random media. Our

preliminary studies in one-dimension,

using Transfer Matrix calculations, show

a marked increase of the transmittance

(evidently larger number of high trans-

mission peaks in the figure) in compari-

son to a system without symmetry.

Further, we discuss the possibility of

realizing nanostructured media using

techniques based on laser direct-writing.

The high precision on offer coupled with

rapid speed in fabricating designer struc-

tures should enable statistical studies

of light transport in one-, two- and

three-dimensional random media.

Iodine spectroscopy for single ion precision experiments

Nivedya Valappol, Elwin A. Dijck,

Amita Mohanty, Oliver Böll, Klaus Jungmann,

and Lorenz Willmann

Van Swinderen Institute, FMNS, University of

Groningen, The Netherlands

Single ion spectroscopy for measure-

ments of atomic parity violation needs

precise optical frequency standards. We

employ high resolution saturated absorp-

tion spectroscopy of 127I2 at the wave-

length of 650nm in order to provide an

absolute reference frequency for single

ion spectroscopy of Ba+. The frequency

modulation spectroscopy of these iodine

hyperfine transitions are studied in terms

of frequency stability and reproducibility

on the level of 10-12 relative uncertainty,

corresponding to sub kHz accuracy

compared to a GPS stabilized frequency

comb. For an accurate analysis of the

transition parameter take signal shape

due to the lock-in detection technique

has to be taken in account. In particular

we studied the modulation depth, laser

intensities and the temperature and

vapor pressure of the molecular iodine.

The presented scheme can be employed

also for other transitions which require

high stability of laser light sources.

58

P65 P66

Ultrafast time-resolved (S)TEM using RF-cavities

Wouter Verhoeven1, Jasper van Rens1,

Erik Kieft2, Peter Mutsaers1, and Jom Luiten1

1 Coherence & Quantum Technology Group,

Eindhoven University of Technology,

P.O. Box 513, 5600 MB Eindhoven,

the Netherlands2 FEI Company, Achtseweg Noord 5,

5651 GG Eindhoven, the Netherlands

At the Eindhoven University of

Technology research is being done in

collaboration with FEI Company on a

time-resolved transmission electron

microscope based on 3 GHz RF cavities

accurately synchronized to a mode-locked

laser. We have shown that with these

cavities a continuous electron beam can

be chopped into 100 fs bunches without

significant loss of beam quality. This

allows for the generation of highly

coherent femtosecond electron pulses

at a high repetition rate, enabling us to

perform time-resolved microscopy at

femtosecond timescales with a high

brightness and a high spatial resolution.

Currently, we are optimizing cavity design

for robust and easy implementation in

an electron microscope. Furthermore,

a 200 keV FEI Tecnai TEM has been

installed and modified to allow the

insertion of such a cavity, and will soon

be tested in pulsed operation.

Programmable quantum interference inscattering materials

T.A.W. Wolterink, R. Uppu, G. Ctistis,

A.P. Mosk, and P.W.H. Pinkse

MESA+ Institute for Nanotechnology,

University of Twente, The Netherlands

Random-scattering materials are excel-

lent physical unclonable functions for

use as optical keys in, e.g., quantum-

secure authentication. In order to use

this functionality in other quantum-

information protocols, it is necessary to

be able to control quantum interference

in these random-scattering materials. By

adaptive phase-modulation of incident

wavefronts, we are able to transform the

speckle patterns arising from random-

scattering materials to include the func-

tionality of multiport linear optical cir-

cuits. Applying our method to quantum

light enables adaptive quantum optical

experiments, with high flexibility in the

control of quantum interference between

multiple optical modes. We demonstrate

our control over quantum interference

by showing programmable Hong-Ou-

Mandel interference in random multiple-

scattering materials.

59

P67 P68

Charge state dynamics and electro-magnetically induced transparency in4H-SiC divacancy ensembles

Xu Yang1, Olger V. Zwier1, Danny O’Shea1,

Erik Janzén2, Nguyen T. Son2,

and Caspar H. van der Wal1

1 University of Groningen2 Linköping Universit

Divacancy defect spin states in 4H poly-

type silicon carbide have been optically

addressed and coherently controlled[1]

and have shown long coherence times[2].

These properties are promising in appli-

cations such as quantum memory and

quantum communications.

Divacancies can change their charge

states and thereby their optical transi-

tions via a bleaching-repumping cycle.

We investigate the dynamics of this

process. Ensembles of charge-neutral

c-axis divacancy spin states allow optical

coherent control and provide strong

interactions. With these ensembles we

experimentally demonstrate electro-

magnetically induced transparency (EIT),

which is a direct measure of spin cohe-

rence times and coherent interaction

strengths of the system. We investigate

the EIT quality under varying experimen-

tal conditions. Optical waveguides can

be used to further enhance EIT and build

on-chip devices. We also show an experi-

ment that proves the possibility of wave-

guiding using a sandwich-structured SiC

slab waveguide sample.

[1] Zwier, O. V. et al. Sci. Rep. 5, 10931 (2015)[2] Koehl, W. F. et al. Nature 479.7371 (2011)

Realizing an all-optical quantum memory with divacancy spins in SiC

Olger V. Zwier1, Xu Yang1, Danny O'Shea1,

Alexander R. Onur1, Erik Janzén2,

Nguyen T. Son2, and Caspar H. van der Wal1

1 Zernike Institute for Advanced Materials,

University of Groningen, The Netherlands2 Department of Physics, Chemistry and

Biology, Linköping University, Sweden

Divacancy defects in silicon carbide

have long-lived electronic spin states and

sharp optical transitions [1]. Because of

the various polytypes of SiC, hundreds of

unique divacancies exist, many with spin

properties comparable or superior to the

nitrogen-vacancy center in diamond.

Here we show our progress in realizing

a fast yet long-coherent all-optical

quantum memory with divacancy-bound

spins. Combining control over the defect

charge state with optical spin-pumping

techniques, we can circumvent spin

inhomogeneity, and are taking steps

towards storing the quantum state of

a light pulse on a large spin ensemble.

In subsequent readout of the memory, a

key role is played by electromagnetically

induced transparancy (EIT), in allowing

the light to exit the material without

reabsorption.

60

P69

Phase singularities in random waves:Exploring optical statistics at the nanoscale

L. De Angelis, R.E.C. van der Wel, B. le Feber,

and L. Kuipers

FOM Institute AMOLF, Amsterdam,

The Netherlands

Phase singularities are locations in which

the phase of a complex field is undefined.

In two-dimensional random waves these

deep-subwavelength (size zero) optical

entities are points in the plane, with

distributions reminiscent of those of

particles in ionic liquids [1]. By mapping

the in-plane complex optical field above

a chaotic resonator [2], we experimentally

determine the statistics of phase singula-

rities in random waves.

[1] M.V. Berry and M.R. Dennis. Proc. R. Soc. Lond. A(2000).

[2] C. Liu, et al. Nat. Phys. (2015).

Figure: Experimental pair correlation function (circles) and charge correlation function (triangles) of phase singularities in random waves. Results are in excellent agreement with theoretical predictions [1] (lines).

Workgroups

62

Workgroups

AMSTERDAM (FOM Institute AMOLF)prof. dr. H.J. Bakker Ultrafast Spectroscopyprof. dr. L. Kuipers NanoOpticsprof. dr. A. Polman Photonic Materialsdr. Y. Rezus Biomolecular Photonicsdr. E. Verhagen Photonic Forces

AMSTERDAM (University of Amsterdam)prof. dr. T. Gregorkiewicz Opto-electronics Materialsdr. K. Dohnalovadr. R.Sprik Soft matter physics waves in complex mediadr. N.J. van Druten Quantum Gases, Atom Optics, Quantum Information.dr. T.W. Hijmans Rydberg atoms, atom chipsprof. dr. H.B. van Linden van den Heuvellprof.dr. F. Schreckprof. dr. G.V. Shlyapnikovdr. R.J.C. Spreeuwprof. dr. J.T.M. Walraven

AMSTERDAM (VU University)prof. dr. W. Ubachs Frequency metrology and variation of fundamental constants,dr. W. Vassen quantum gasses and BEC, cold molecules, ultrafast lasers and prof. dr. K.S.E. Eikema a frequency combs, X-ray generation and lensless imaging, dr. H.L. Bethlem spectroscopy of small molecules (of atmospheric anddr. S. Knoop astrophysical interest), XUV laser spectroscopy, dr. J.C.J. Koelemeij fiber-optic time and frequency transfer.prof. dr. J.F. de Boer prof. dr. M.L. Grootprof. dr. D. Iannuzzidr. F. Ariesedr. S. Witte

Biophotonics, biophysics, Optical Coherence Tomography,spectroscopy, non-linear, CARS, SRS and Raman microscopy, ,ultrafast spectroscopy, optomechanics in Life Sciences, High Precision Experiments on Surface Forces, Table-Top Dark Energy.

63

Workgroups

DELFT (University of Technology)prof. dr. H. P. Urbachdr. S. Pereiradr. A.J.L. Adamdr. F. Bociortdr. N. Bhattacharya

prof. dr. ir. R. Hanson

EINDHOVEN (University of Technology)dr. ir. G.J.H. Brussaarddr. ir. S.J.J.M.F. Kokkelmansprof. dr. K.A.H. van Leeuwenprof. dr. ir. O.J. Luitendr. ir. P.H.A. Mutsaersdr. ir. E.J.D. Vredenbregtprof. dr. J. Gómez Rivas

Near and far field optical inspection techniquesOptical designOptical lithographyOptical nanostructures and metamaterials.Thin films Terahertz imaging & spectroscopyApplications of femtosecond frequency comb lasers in lengthmeasurement, breath analysis and gas detectionQuantum science in the solid state, quantum. information,diamond defect centers.

Ultra cold plasma’s, Rydberg atoms, bright ion and electronbeams, atom optics, nanostructures by atom lithography,Compact (laser-driven) electron accelerators; generation ofcollective radiation (THz to XUV), including FEL physics; femtosecond-pulse physics, cold atomic interactions, quantum gasesDIFFER

64

Laser physics and nonlinear optics Integrated laser physics and nonlinear opticsHigh-harmonic generationFree-electron lasers. Biomolecular control, field shaping, coherent control,nonlinear/vibrational.Spectroscopy/microscopy, nanophotonics,plasmonic structures, near-field probe microscopy.Integrated OpticsNano biophysics, genomic, proteomics, spectroscopy.

Biomedical photonic imaging, tissue imaging photoacoustic and acoustic-optic imaging and speckle based perfusion imaging.

Medical cell biophysics, (non-)linear Raman spectroscopy and microscopy, Correlative Raman-electron microscopy,nano-particle micro-spectroscopy, surface plasmon diagnostics and spectroscopy and imaging, medical micro-devices, point-of-care diagnostics, electro-opto-fluidics.Photonic crystals, scattering and localization.

Nanophotonics and Quantum optics

Workgroups

ENSCHEDE (University of Twente)prof. dr. K.J. Boller dr. H. M. J. Bastiaensdr. P.J.M. van der Slot

prof. dr. J.L. Herekdr. ir. H.L. Offerhaus dr. ir. A. Huijser

dr. S. Garcia-Blancoprof. dr. V. Subramaniamdr. M.L Bennink prof.dr. Carl Figdor dr. H. Kanger dr. R. Kooyman dr. I. Segers-Nolten prof.dr.ir. W. Steenbergenprof.dr. L.F. de Geus-Oeidr. S. Manohardr.ir. I.M. Vellekoopprof. dr. L.W.M.M. Terstappendr. C. Otto dr. R. Schasfoortdr. M. Beck

prof. dr. W.L. Vosprof.dr. A.P. Moskdr. P.W.H. Pinkse

65

Workgroups

GRONINGEN (University of Groningen)dr. M.S. Pchenichnikovdr. R.I. Tobeyprof. dr. J. Knoesterdr. T. L.C. Jansendr. V.A. Malyshevdr. W.R. Brownedr. G. Palasantzasprof. dr. A. van Oijendr. T.M. Cordesprof. dr. ir. C.H. van der Wal prof. dr. J.C. Hummelen

prof. dr. M. A. Loidr. L.J.A. Kosterprof. dr. J. Yeprof. dr. ir. R. Hoekstradr. T. Schlathölter

prof. dr. K. Jungmannprof. dr. H. Wilschutdr. L. Willmanndr. C.J. G. Onderwaterdr. S. Hoekstra

LEIDEN (Leiden University)prof.dr. D. Bouwmeesterdr. M.J.A. de Dood dr. E.R. Elieldr. M.P. van Exterprof. dr. J.P. Woerdmanprof. dr. G. Nienhuis prof. dr. E.J.J. Groenenprof. dr. M. Orritdr. P. Gastdr. M.I. Huberprof.dr. H.V.J. Linnartz

Optical Condensed Matter Physics.Multidimensional femtosecond optical spectroscopy.Theory of Condensed Matter

Molecular Systems and InterfacesNanoscale surface physics and Casimir forcesSingle-Molecule Biophysics &Molecular MicroscopyPhysics of Quantum Devices.Chemistry of (bio)molecular materials and devices &FOM focus group Next generation organic photovoltaicsPhotophysics and OptoElectronics

Device Physics of Complex MaterialsRadiation damage in biomolecular systems.Highly-charged ion physics, reaction microscopy, laser cooling and trapping, atomic processes at surfaces.Precise control and spectroscopy of ions, atoms and molecules, for tests of fundamental interactionsand symmetries.

Quantum entanglement, optomechanics, semiconductorquantum physics (spintronics), photonic crystals, nanophotonics, plasmonics

Optical traps, light forces, quantum informationSingle-molecule physics, Electron Paramagnetic Resonance

Laboratory astrophysics

66

Workgroups

NIJMEGEN (Radboud University)prof. dr. D.H. Parkerdr. F.J.M. Harren

dr. S.Y.T. van de Meerakkerprof. dr. Th. Rasing prof. dr. A. Kirilyukdr. A.V. Kimelprof. dr. ir. G.C. Groenenboomdr. H.M. Cuppenprof. dr. ir. A. van der Avoird prof. dr. W.L. Meerts dr. R.T. Jongmadr. A.M. Rijsdr. A.F.G. van der Meerdr. B. Redlichprof. dr. J. Oomensdr. J.M. Bakkerdr. G. Berden

UTRECHT (Utrecht University)prof. dr. P. van der Straten

dr. D. van Oostenprof.dr.ir. H.T.C. Stoof

dr. R.A. Duine

Laser physics, molecular photodissociation, atmosheric processes, trace gas detection, medical and biological applications.Cold and controlled collisionsTime-resolved laser spectroscopy, nanomagnetism, spin- and magnetization dynamics, atomic clusters, THz spectroscopy, nonlinear opticsMolecular interactions and light-induced processes.Mobility in solid molecular materials

Biomolecular structure, Molecular and atmospheric Physics,THz generation, detection and applications to biomoleculesand bio-mimetics, Free Electron Laser.FEL physics, generation and application of infrared/THzradiation.Molecular physics. infrared ion spectroscopy and structure,conformation selective spectroscopy, mass spectrometry, biomolecules, metal clusters, astrochemistry, coordinationchemistry

Laser manipulation of atoms, Bose-Einstein condensation,Atom optics.Cold atom nanophotonics.Dynamics of Bose-Einstein Condensates, Quantum Effects in Degenerate Fermion and/or Boson gases.Spintronics.

Design: Final Design

Print: Janssen Repro Nijmegen

This meeting is organized under the auspices of the

NNV-section Atomic, Molecular and Optical Physics,

with financial support of the Dutch Science Foundation

and the Foundation FOM.

The program is compiled by:Martin van ExterDries van Oosten

This meeting is organized under the auspices of the

NNV-section Atomic, Molecular and Optical Physics,

with financial support of the Dutch Science Foundation

and the Foundation FOM.