Development of high-performance multi-layer superconducting nanowire single-photon detectors

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20438
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: National Institute of Information and Communications Technology
• Principal Investigator: China Fumihiro 国立研究開発法人情報通信研究機構, 未来ICT研究所神戸フロンティア研究センター, 研究員 (90912436)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 超伝導ナノストリップ単一光子検出器 / SNSPD / SSPD / 誘電体多層膜

Outline of Final Research Achievements

In this study, we have developed an SSPD composed of two nanowires and multiple dielectric multilayer cavities, which realizes flexible optical design and high detection efficiency. We designed the nanowire stacked SSPD with wideband optical absorptance for the visible wavelength band. We confirmed that the polarization dependence of the nanowire stacked SSPD can be reduced even when the two meandering nanostrips are arranged in the same direction. In addition, in order to realize a nanowire stacked SSPD, we have developed a device fabrication process with dielectric surface planarization process using ion beam irradiation and bias sputtering.

Free Research Field

超伝導エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

超伝導ナノワイヤ２層と複数の誘電体多層膜光共振器からなるナノワイヤ積層型SSPDにより、従来よりも自由度の高い光学設計が可能なSSPDを開発することができる。また本研究で開発したナノワイヤ積層型SSPDは、上下のナノワイヤの向きを揃えた場合でも偏向依存性を低減することができる。本研究により、偏向依存性を積極的に低減した、高効率なSSPDを開発することが可能となる。