High detection efficiency and rate superconducting nanowire single-photon detector with a composite optical structure

Min Gu; Lin Kang; Labao Zhang; Tao Jia; Chao Wan; Ruiying Xu; Xiaozhong Yang; Peiheng Wu

doi:10.1117/12.2078621

16 March 2015 High detection efficiency and rate superconducting nanowire single-photon detector with a composite optical structure

Min Gu, Lin Kang, Labao Zhang, Tao Jia, Chao Wan, Ruiying Xu, Xiaozhong Yang, Peiheng Wu

Author Affiliations +

Proceedings Volume 9357, Physics and Simulation of Optoelectronic Devices XXIII; 93571K (2015) https://doi.org/10.1117/12.2078621
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

Citation Download Citation

Min Gu, Lin Kang, Labao Zhang, Tao Jia, Chao Wan, Ruiying Xu, Xiaozhong Yang, and Peiheng Wu "High detection efficiency and rate superconducting nanowire single-photon detector with a composite optical structure", Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 93571K (16 March 2015); https://doi.org/10.1117/12.2078621

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