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