Development and Evaluation of Superconducting Nanowire Single-Photon Detectors for 900-1100 nm Photon Detection

Fumihiro CHINA  Shigehito MIKI  Masahiro YABUNO  Taro YAMASHITA  Hirotaka TERAI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.5   pp.212-215
Publication Date: 2020/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019SES0001
Type of Manuscript: BRIEF PAPER
Category: Superconducting Electronics
Keyword: 
superconductivity,  single-photon detectors,  SSPD,  dielectric multilayer,  

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Summary: 
Superconducting nanowire single-photon detectors(SSPDs or SNSPDs) can detect single photons in a wide spectrum range from ultraviolet to mid-infrared wavelengths. We developed SSPDs for the light wavelength of 900-1100 nm, where it is difficult to achieve high detection efficiency by either Si or InGaAs avalanche photodiodes. We designed and fabricated the SSPD with non-periodic dielectric multilayers (DMLs) composed of SiO2 and TiO2 to enhance the optical absorptance in the wavelength range of 900-1100 nm. We measured the detection efficiency (DE) in the wavelength range of 800-1360 nm using a supercontinuum light source and found that the wavelength dependence of DE was in good agreement with the simulated spectrum of the optical absorptance of the nanowire device on the designed DML. The highest system DE was 81.0% for the wavelength of 980 nm.