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Proceedings Paper

High detection efficiency and rate superconducting nanowire single-photon detector with a composite optical structure
Author(s): Min Gu; Lin Kang; Labao Zhang; Tao Jia; Chao Wan; Ruiying Xu; Xiaozhong Yang; Peiheng Wu
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Paper Abstract

Superconducting nanowire single-photon detectors (SNSPDs) with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance system detection efficiency and count rates. Numerical simulation by finite-difference time-domain method shows that the photon absorption capacity of SNSPDs with a composite optical structure can be enhanced significantly by adjusting the parameters of the phase-grating and optical cavity structures. The absorption capacity of the superconducting nanowires reached 69.8% at the wavelength of 850 nm with 0.3 filling factor. When the filling factor was reduced to only 0.08, the absorption capacity is still 48.52%. It greatly decreased the kinetic inductance of SNSPDs, and improved the count rates.

Paper Details

Date Published: 16 March 2015
PDF: 8 pages
Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 93571K (16 March 2015); doi: 10.1117/12.2078621
Show Author Affiliations
Min Gu, Nanjing Univ. (China)
Lin Kang, Nanjing Univ. (China)
Labao Zhang, Nanjing Univ. (China)
Tao Jia, Nanjing Univ. (China)
Chao Wan, Nanjing Univ. (China)
Ruiying Xu, Nanjing Univ. (China)
Xiaozhong Yang, Nanjing Univ. (China)
Peiheng Wu, Nanjing Univ. (China)

Published in SPIE Proceedings Vol. 9357:
Physics and Simulation of Optoelectronic Devices XXIII
Bernd Witzigmann; Marek Osiński; Fritz Henneberger; Yasuhiko Arakawa, Editor(s)

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