Superconducting microstrip single-photon detector with system detection efficiency over 90%at 1550 nm  

作　　者：GUANG-ZHAO XU WEI-JUN ZHANG LI-XING YOU JIA-MIN XIONG XING-QU SUN HAO HUANG XIN OU YI-MING PAN CHAO-LIN LV HAO LI ZHEN WANG XIAO-MING XIE 

机构地区：[1]State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences(CAS),Shanghai 200050,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China

出　　处：《Photonics Research》2021年第6期958-967,共10页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61971409);Youth Innovation Promotion Association of the Chinese Academy of Sciences(2019238);National Key Research and Development Program of China(2017YFA0304000);Science and Technology Commission of Shanghai Municipality(18511110202,2019SHZDZX01).

摘　　要：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 covering the same area,the superconducting microstrip single-photon detector(SMSPD)has smaller kinetic inductance,higher working current,and lower requirements in fabrication accuracy,providing potential applications in the development of ultralarge active area detectors.However,the study of SMSPD is still in its infancy,and the realization of its high-performance and practical use remains an open question.This study demonstrates a NbN SMSPD with a nearly 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.

关 键 词：POLARIZATION PHOTON SYSTEM 

分 类 号：TN15[电子电信—物理电子学]