1. Superconducting microstrip single-photon detector with system detection efficiency over 90% at 1550 nm
- Author
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Xu, Guang-Zhao, Zhang, Wei-Jun, You, Li-Xing, Xiong, Jia-Min, Sun, Xing-Qu, Huang, Hao, Ou, Xin, Pan, Yi-Ming, Lv, Chao-Lin, Li, Hao, Wang, Zhen, and Xie, Xiao-Ming
- Subjects
Physics - Instrumentation and Detectors ,Physics - Optics - Abstract
Generally, a superconducting nanowire single-photon detector (SNSPD) is composed of wires with a typical width of ~100 nm. Recent studies have found that superconducting strips with a micrometer-scale width can also detect single photons. Compared with the SNSPD, the superconducting microstrip single-photon detector (SMSPD) has smaller kinetic inductance, higher working current, and lower requirement in fabrication accuracy, providing potential applications in the development of ultra-large active area detectors. However, the study on SMSPD is still in its infancy, and the realization of its high-performance and practical use remains an opening question. This study demonstrates a NbN SMSPD with a saturated system detection efficiency (SDE) of ~92.2% at a dark count rate of ~200 cps, a polarization sensitivity of ~1.03, and a minimum timing jitter of ~48 ps, at the telecom wavelength of 1550 nm when coupled with a single mode fiber and operated at 0.84 K. Furthermore, the detector's SDE is over 70% when operated at a 2.1-K closed-cycle cryocooler., Comment: 10 pages,7 figures, 2 tables
- Published
- 2021
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