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Title: Photon-noise limited sensitivity in titanium nitride kinetic inductance detectors

We demonstrate photon-noise limited performance at sub-millimeter wavelengths in feedhorn-coupled, microwave kinetic inductance detectors made of a TiN/Ti/TiN trilayer superconducting film, tuned to have a transition temperature of 1.4 K. Micro-machining of the silicon-on-insulator wafer backside creates a quarter-wavelength backshort optimized for efficient coupling at 250 μm. Using frequency read out and when viewing a variable temperature blackbody source, we measure device noise consistent with photon noise when the incident optical power is >0.5 pW, corresponding to noise equivalent powers >3×10{sup −17} W/√(Hz). This sensitivity makes these devices suitable for broadband photometric applications at these wavelengths.
Authors:
; ; ; ; ; ; ; ; ;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [1] ;  [5] ;  [6]
  1. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305 (United States)
  2. Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd St., Philadelphia, Pennsylvania 19104 (United States)
  3. School of Earth and Space Exploration, Arizona State University, 781 S Terrace Rd., Tempe, Arizona 85281 (United States)
  4. Department of Physics, Stanford University, Stanford, California 94305 (United States)
  5. (China)
  6. Quantum Optoelectronics Laboratory, Southwest Jiaotong University, Chengdu (China)
Publication Date:
OSTI Identifier:
22412667
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; INDUCTANCE; MICROWAVE RADIATION; NOISE; PHOTONS; READOUT SYSTEMS; SENSITIVITY; SILICON; SUPERCONDUCTING FILMS; TITANIUM; TITANIUM NITRIDES; TRANSITION TEMPERATURE