nanoplasmonic structures: designing electromagnetic fields benji börner 1

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Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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Page 1: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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Nanoplasmonic structures: Designing electromagnetic fields

Benji Börner

Page 2: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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Content

short revision Surface Plasmon Polariton (SPP) mathematical SPP excitation by electons SPP excitation by photons nanoplasmonic structures experimental applications

Page 3: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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surface plasmons on metal surface coherent oscillation of free electrons can be excited by electrons and photons

Revision

www.ucd.ie

Page 4: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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boundary condition by Maxwell for em wave

mathematical explanation – dispersion relation

mysite.du.edu/~lconyers/SERDP/Figure5.htm

Page 5: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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mathematical explanation – dispersion relation

Page 6: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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mathematical explanation – dispersion relation

real part imaginary part

Page 7: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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damping due to ohmic losses and electron-core interactions

manifestation in imaginary part of dielectric function

mathematical explanation – dispersion relation

Page 8: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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intensity decreased by absorption (E²)

propagation length: intensity at distance x: skin depth formula:

mathematical explanation

http://erbium.ece.mcgill.ca/research/plasmonic-interconnects/

Page 9: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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electron scattering on surface parallel part creates surface plasmon polariton

SPP excitation by electrons

Yang Zhang et.al. “Edge scattering of surface plasmons excited by scanning tunneling microscopy”, Maier - Plasmonics

Page 10: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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need to match wavelength and momentum

tools like prisms or gratings needed

SPP excitation by photons

http://pjmedia.com/lifestyle/files/2013/07/Dispersion_prism.jpg

Page 11: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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prism in Kretschmann configuration different dielectric functions match

momentum evanescent wave excites SPP

SPP excitation by photons - prism

Google.de -> Kretschmann configuration

Page 12: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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prism in Otto configuration

SPP excited on top of metal film

SPP excitation by photons - prism

http://skullsinthestars.com/2010/09/21/optics-basics-surface-plasmons/Minghui Hong et.al „ Maskless multibeam laser irradiation enables large-area nanostructure fabrication“

Page 13: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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excitation with grating

reciprocal grating vector gives imaginary part

SPP excitation by photons - grating

Byoungho Lee et.al. „Shaping and focusing light beams with plasmonics”

Page 14: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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SPP scatter on defects

defects provide free space radiation

SPP excitation

http://www.westga.edu/~chem/facultydocs/stuart.htm

Page 15: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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nanoplasmonic structures – gratings

Yongqi Fu et. al. “Plasmonic Lenses”

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nanoplasmonic structures – flat gratings

http://www.cs.huji.ac.il/~ulevy/facil.php

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nanoplasmonic structures – concave gratings

Byoungho Lee et.al. „Shaping and focusing light beams with plasmonics“

Page 18: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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nanoplasmonic structures – concentric gratings

Yongqi Fu et. al. “Plasmonic Lenses”

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nanoplasmonic structures – nanoholes

Carsten Sönnichsen “Plasmons in metal nanostructures”Maier - Plasmonics

Page 20: Nanoplasmonic structures: Designing electromagnetic fields Benji Börner 1

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investigation of surfaces to find defects

identify density changes

molecular detectors

experimental applications

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Thank you!