A High-Efficiency Broadband Superconducting Nanowire Single-Photon Detector with a Composite Optical Structure

Superconducting nanowire single-photon detectors （SNSPDs） with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance both the system detection efficiency and the response bandwidth. Numerical simulation by the finite-difference time-domain meth...

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Bibliographic Details
Published inChinese physics letters Vol. 32; no. 3; pp. 145 - 148
Main Author 顾敏 康琳 张蜡宝 赵清源 郏涛 万超 徐睿莹 杨小忠 吴培亨
Format Journal Article
LanguageEnglish
Published 01.03.2015
Subjects
Broadband
Computer simulation
Detectors
Finite difference method
Holes
Mathematical models
Nanowires
Superconductivity
光学结构
单光子探测器
器具
复合
宽带
时域有限差分
纳米线
超导
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/3/038501

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Summary:Superconducting nanowire single-photon detectors （SNSPDs） with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance both the system detection efficiency and the response bandwidth. Numerical simulation by the 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 at multiple frequency bands. The absorption capacity of the superconducting nanowires reaches 70%, 72%, 60.73%, 61.7%, 41.2%, and 46.5% at wavelengths of 684, 850, 732, 924, 1256, and 1426nm, respectively. The use of a composite optical structure reduces the total filling factor of superconducting nanowires to only 0.25, decreases the kinetic inductance of SNSPDs, and improves the count rates.
Bibliography:11-1959/O4
GU Min, KANG Lin, ZHANG La-Bao, ZHAO Qing-Yuan, JIA Tao, WAN Chao, XU Rui-Ying, YANG Xiao-Zhong, WU Pei-Heng（Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093）
Superconducting nanowire single-photon detectors （SNSPDs） with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance both the system detection efficiency and the response bandwidth. Numerical simulation by the 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 at multiple frequency bands. The absorption capacity of the superconducting nanowires reaches 70%, 72%, 60.73%, 61.7%, 41.2%, and 46.5% at wavelengths of 684, 850, 732, 924, 1256, and 1426nm, respectively. The use of a composite optical structure reduces the total filling factor of superconducting nanowires to only 0.25, decreases the kinetic inductance of SNSPDs, and improves the count rates.
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/3/038501