optical lumped element mkids
DESCRIPTION
The Optical/UV MKID Team: UCSB: Ben Mazin, Sean McHugh, Kieran O’Brien, Seth Meeker, Erik Langman , Danica Marsden, Matt Strader Caltech : Jonas Zmuidzinas , Sunil Golwala , David Moore JPL: Bruce Bumble, Rick LeDuc. Optical Lumped Element MKIDs. Ben Mazin, February 2012. - PowerPoint PPT PresentationTRANSCRIPT
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Optical Lumped Element MKIDs
Ben Mazin, February 2012
The Optical/UV MKID Team:
UCSB: Ben Mazin, Sean McHugh, Kieran O’Brien, Seth Meeker, Erik Langman, Danica Marsden, Matt StraderCaltech: Jonas Zmuidzinas, Sunil Golwala, David MooreJPL: Bruce Bumble, Rick LeDuc
Mazin Lab @ UCSB
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Microwave Kinetic Inductance Detectors
Cooper Pair
Energy GapSilicon – 1.10000 eVAluminum – 0.00018 eV
Energy resolution:
Inductor is a Superconductor!
MKID Equivalent Circuit
Typical Single Photon Event
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SCI2-B: Demonstrated at Palomar!
Mazin et al., Optics Express 2012
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Tapering
Uniform Legs Rectangular Legs Trapezoidal Legs
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Measured @ 3500xMeasured @ 3500x
22.22.42.62.833.23.43.63.84
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Site
Wid
th (u
m)
B-0207
B-0210
B-0310
Over or under etch of up to 100 nm, but leg widths consistent to 25 nm
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SCI2-B Energy Resolution
20 nm TiN on Silicon
Tc = 0.8 K
QP lifetime ~ 50 μs
Qi ~ 1,000,000
R=E/ΔE=16 at 254 nm
R limited by HEMT/power handling/Qi
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SCI-2B Uniformity
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Lessons Learned and Outstanding Questions
First MKID device with multiple feedlines (I think?)
Must have good ground planes or massive crosstalkFloating finite CPW not OK!
Tc gradients cause resonator collisions – simulate your frequency coding scheme with gradients to avoid systematic collision issues
QP lifetime varies substantially, even on a single device. 20-100 microsecond spread! Strange!
Need more robust algorithms for setting up large arrays
Choosing resonatorsFiguring out optimal powers
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ARCONS OverviewArray Camera for Optical to Near-IR Spectrophotometery (ARCONS)
First Light: July 28, 2011, Palomar 200” Coudé
Lens coupled 1024 (32x32) pixel array in cryogen-free ADR (first lens coupled optical/nIR 100 mK instrument – learned a lot about IR blocking!)
0.2” pixels yields 7”x7” FOVNext run, 45x45 pixels with 0.4” plate scale yields 18”x18” FOV
400 nm to 1100 nm simultaneous bandwidth with maximum count rate of ~2000 cts/pixel/sec
Next run, 350-1350 nm
Energy resolution R~10-20 at 400 nm
50 Gbit/sec -> FPGA -> 32 Mbit/sec
Entrancewindow
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Optics
300K 3K (Lyot Stop) 100 mK
IR Blocking
300K 4K 4KDewar Lyot ReimagingWindow Stop Optics
See Kieran O’Brien for Details
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Readout Crate
Sean McHugh’s Talk Tomorrow
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To Palomar!
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ARCONS
16.67 ft
5.67 ft
135 ft
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ARCONS First Light Image
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Crab Pulsar
Archival pulse profile for Crab (Shearer 2003)
Pulse profile measured with ARCONS
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Dancing with the Stars
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Mega-zProposed Keck Nasmyth Instrument (dewar doesn’t tip past ~50 degrees, flexure concerns)
Uses an aperture mask in the focal plane to image objects of interest only
Maps one object to one MKID pixelSky subtraction done with empty MacropixelsActive mask alignment using feedback from science array
10’x10’ or 12’ diameter FOV. 10,000 objects.
R~50
mI < 26
0.32 – 1.35 μm (possibly up to 1.8 μm)
6”x6” Macropixels (image not to scale)
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Simulated Mega-Z Spectra
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Future PlansField ARCONS in fall (Lick) and winter (Palomar) with a 2025 pixel array
Detector Goals (Danica’s Talk):Eliminate substrate events (already done?)Increase energy resolutionIncrease uniformityIncrease QE