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Title: Effect of the wire width on the intrinsic detection efficiency of superconducting-nanowire single-photon detectors

A thorough spectral study of the intrinsic single-photon detection efficiency in superconducting TaN and NbN nanowires with different widths has been performed. The experiment shows that the cut-off of the intrinsic detection efficiency at near-infrared wavelengths is most likely controlled by the local suppression of the barrier for vortex nucleation around the absorption site. Beyond the cut-off quasi-particle diffusion in combination with spontaneous, thermally activated vortex crossing explains the detection process. For both materials, the reciprocal cut-off wavelength scales linearly with the wire width where the scaling factor agrees with the hot-spot detection model.
Authors:
;  [1] ; ;  [2] ; ;  [3] ;  [3] ;  [4] ;  [5] ;  [3] ;  [4] ;  [6] ;  [4] ;  [1] ;  [7]
  1. Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstr. 2, 12489 Berlin (Germany)
  2. Institute of Micro- und Nano-electronic Systems (IMS), KIT, Hertzstrasse 16, 76187 Karlsruhe (Germany)
  3. Department of Physics, Moscow State Pedagogical University, 1 Malaya Pirogovskaya, 119991 Moscow (Russian Federation)
  4. (Russian Federation)
  5. (State University), 9 Institutskiy pereulok, Dolgoprudny, Moscow region 141700 (Russian Federation)
  6. Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105 (Russian Federation)
  7. (Germany)
Publication Date:
OSTI Identifier:
22308540
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; DETECTION; DIFFUSION BARRIERS; EFFICIENCY; HOT SPOTS; NANOWIRES; NIOBIUM NITRIDES; PHOTONS; QUANTUM WIRES; QUASI PARTICLES; SCALING; TANTALUM NITRIDES; WIDTH