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Design of an Antireflection Coating for High-efficiency Superconducting Nanowire Single-photon Detectors

Authors
Choi, J[Choi, Jiman]Choi, G[Choi, Gahyun]Lee, SK[Lee, Sun Kyung]Park, K[Park, Kibog]Song, W[Song, Woon]Lee, DH[Lee, Dong-Hoon]Chong, Y[Chong, Yonuk]
Issue Date
Aug-2021
Publisher
OPTICAL SOC KOREA
Keywords
Antireflection coating; Detection efficiency; Superconducting nanowire single photon detector
Citation
CURRENT OPTICS AND PHOTONICS, v.5, no.4, pp.375 - 383
Indexed
SCIE
SCOPUS
KCI
Journal Title
CURRENT OPTICS AND PHOTONICS
Volume
5
Number
4
Start Page
375
End Page
383
URI
https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/91707
DOI
10.3807/COPP.2021.5.4.375
ISSN
2508-7266
Abstract
We present a simulation method to design antireflection coating (ARCs) for fiber-coupled superconducting nanowire single-photon detectors. Using a finite-element method, the absorptance of the nanowire is calculated for a defined unit-cell structure consisting of a fiber, ARC layer, nanowire absorber, distributed Bragg reflector (DBR) mirror, and air gap. We develop a method to evaluate the uncertainty in absorptance due to the uncontrollable parameter of air-gap distance. The validity of the simulation method is tested by comparison to an experimental realization for a case of single-layer ARC, which results in good agreement. We show finally a double-layer ARC design optimized for a system detection efficiency of higher than 95%, with a reduced uncertainty due to the air-gap distance.
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