ISSTT Proceedings

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Superconducting NbN-based ultrafast hot-electron single-photon detector for infrared range

Authors:
A. Verevkin, Y. Xu, X. Zheng C. Williams, Roman Sobolewski, 0. Okunev, K. Smirnov, G. Chulkova, A. Korneev, A. Lipatov, G. N. Gol'tsman
Abstract:
Single-photon detector (SPD) with GHz counting rate for infrared range, based on the supercurrent-assisted hotspot effect in a superconducting NbN thin-film microstructure has been developed. A photon-induced hotspot leads to temporary formation of a resistive barrier across the narrow superconducting sensor stripe and results in an easily measurable voltage pulse. Subsequent hotspot healing in <100 ps time frame, restores the superconductivity (zero-voltage state), and the detector is ready to register another photon. It exhibits an experimentally measured intrinsic quantum efficiency up to ~20% and negligible dark counts. Spectral dependence of the photoresponse is presented.
Categories:
Detectors
Year:
2001
Session:
10
Full-text:
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Page Number(s):
462-468