Temperature dependence of niobium superconducting nanowire single-photon detectors in He-3 cryocooler

被引：9

作者：

Jia, Tao ^{[1
]}

Wan, Chao ^{[1
]}

Zhao, Limin ^{[1
]}

Zhou, Yu ^{[1
]}

Zhao, Qingyuan ^{[1
]}

Gu, Min ^{[1
]}

Jia, Xiaoqing ^{[1
]}

Zhang, Labao ^{[1
]}

Jin, Biaobing ^{[1
]}

Chen, Jian ^{[1
]}

Kang, Lin ^{[1
]}

机构：

[1] Nanjing Univ, RISE, Nanjing 210093, Jiangsu, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2014年 / 59卷 / 28期

基金：

中国国家自然科学基金;

关键词：

Niobium; SNSPD; Dark count; He-3; cryocooler; EFFICIENCY; SYSTEM; STATE;

D O I：

10.1007/s11434-014-0538-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Performances of superconducting nanowire single-photon detectors (SNSPDs) based on low T (C) materials strongly depend on the operating temperatures. We have fabricated infrared-sensitive niobium SNSPDs based on doped niobium (Nb*) films and measured them in He-3 cryocooler. The critical current approaches to the de-pairing current at 0.3 K. Therefore, with the decrease in temperatures, we have observed a monotonous increase of count rate at the wavelength of 1,521 nm and exponential decrease of dark count rate at all bias currents. The possible origin of dark counts for doped Nb devices is also discussed.

引用

页码：3549 / 3553

页数：5

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