| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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A High-Efficiency Broadband Superconducting Nanowire Single-Photon Detector with a Composite Optical Structure |
| 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
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| Cite this article: |
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GU Min, KANG Lin, ZHANG La-Bao et al 2015 Chin. Phys. Lett. 32 038501 |
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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 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 1426 nm, 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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Published: 26 February 2015
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| PACS: |
85.25.Pb
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(Superconducting infrared, submillimeter and millimeter wave detectors)
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07.57.Kp
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(Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors)
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85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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03.67.Hk
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(Quantum communication)
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