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Title: Superconducting nanowire single photon detectors fabricated from an amorphous Mo{sub 0.75}Ge{sub 0.25} thin film

We present the characteristics of superconducting nanowire single photon detectors (SNSPDs) fabricated from amorphous Mo{sub 0.75}Ge{sub 0.25} thin-films. Fabricated devices show a saturation of the internal detection efficiency at temperatures below 1 K, with system dark count rates below 500 cps. Operation in a closed-cycle cryocooler at 2.5 K is possible with system detection efficiencies exceeding 20% for SNSPDs which have not been optimized for high detection efficiency. Jitter is observed to vary between 69 ps at 250 mK and 187 ps at 2.5 K using room temperature amplifiers.
Authors:
; ; ; ; ; ;  [1]
  1. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305 (United States)
Publication Date:
OSTI Identifier:
22311091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 2; Other Information: (c) 2014 U.S. Government; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AMORPHOUS STATE; AMPLIFIERS; COUNTING RATES; DETECTION; EFFICIENCY; GERMANIUM COMPOUNDS; MOLYBDENUM COMPOUNDS; OPERATION; PHOTONS; SATURATION; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0273-0400 K; THIN FILMS