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 Strader Caltech: Jonas Zmuidzinas, Sunil Golwala, David Moore JPL: Bruce Bumble, Rick LeDuc Mazin Lab @ UCSB
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 Presentation
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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
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
SCI2-B: Demonstrated at Palomar!
Mazin et al., Optics Express 2012
Tapering
Uniform Legs Rectangular Legs Trapezoidal Legs
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
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
SCI-2B Uniformity
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
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!)