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journal article·2018-11-01Open access

Improving detection efficiency of superconducting nanowire single-photon detector using multilayer antireflection coating

Hao Li, Xiaoyan Yang, Lixing You, Heqing Wang, Peng Hu, Weijun Zhang, Zhen Wang, Xiaoming Xie

AIP Advances· Volume 8· Issue 11
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Source abstract

Abstract

Optical cavity with backside optical coupling is one of the prevalent optical structures for superconducting nanowire single photon detector. A single layer anti-reflection coating (ARC) on the backside of the substrate is often adopted to enhance the transmittance to the substrate. We here apply a multilayer ARC to further increase the transmittance from 94.5% to 99.5%. An NbTiN SNSPD made on such a substrate with cavity structure presents a system detection efficiency of 90.1% at a dark count rate (DCR) of 100 Hz, which is the best value reported for backside optical coupled SNSPD at 1550 nm. It shows a timing jitter of ∼40.7 ps and the recovery time constant of ∼22.9 ns.
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Research context

Nanomaterials

OpenAlex topics: Advanced Optical Sensing Technologies · Advanced Fiber Laser Technologies · Photonic and Optical Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (CAS) 1 , 865 Changning Rd., Shanghai 200050, China

CAS Center for Excellence in Superconducting Electronics 2 , 865 Changning Rd., Shanghai 200050, China

University of CAS 3 , 19A Yuquan Rd, Beijing 100049, China

Funding

National key R&D Program of China · Program of Shanghai academic Research Learder · National Natural Science Foundation of China · Science and Technology Commission of Shanghai Municipality

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