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Enhancing the performance of superconducting nanowire-based detectors with high-filling factor by using variable thickness

Baghdadi, Resa and Schmidt, Ekkehart and Jahani, Saman and Charaev, Ilya and Mueller, Michael and Colangelo, Marco and Zhu, Di and Ilin, K. and Semenov, Alexey and Jaco, Zubin and Siegel, Michael and Berggren, Karl (2021) Enhancing the performance of superconducting nanowire-based detectors with high-filling factor by using variable thickness. Superconductor Science & Technology, 34, 035010. Institute of Physics (IOP) Publishing. doi: 10.1088/1361-6668/abdba6. ISSN 0953-2048.

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Abstract

Current crowding at bends of superconducting nanowire single-photon detector (SNSPD) is one of the main factors limiting the performance of meander-style detectors with large filling factors. In this paper, we propose a new concept to reduce the influence of the current crowding effect, a so-called variable thickness SNSPD, which is composed of two regions with different thicknesses. A larger thickness of bends in comparison to the thickness of straight nanowire sections locally reduces the current density and reduces the suppression of the critical current caused by current crowding. This allows variable thickness SNSPD to have a higher critical current, an improved detection efficiency, and decreased dark count rate in comparison with a standard uniform thickness SNSPD with an identical geometry and film quality.

Item URL in elib:https://elib.dlr.de/141289/
Document Type:Article
Title:Enhancing the performance of superconducting nanowire-based detectors with high-filling factor by using variable thickness
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Baghdadi, ResaMIT, USAUNSPECIFIED
Schmidt, EkkehartCaltech, USAUNSPECIFIED
Jahani, SamanCaltech, USAUNSPECIFIED
Charaev, IlyaUniversity of KarlsruheUNSPECIFIED
Mueller, MichaelInstitut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIED
Colangelo, MarcoMIT, USAUNSPECIFIED
Zhu, DiMIT, USAUNSPECIFIED
Ilin, K.Institut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Jaco, ZubinPurdue University, USAUNSPECIFIED
Siegel, MichaelUniversität KarlsruheUNSPECIFIED
Berggren, KarlMIT, USAUNSPECIFIED
Date:2 February 2021
Journal or Publication Title:Superconductor Science & Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:34
DOI :10.1088/1361-6668/abdba6
Page Range:035010
Publisher:Institute of Physics (IOP) Publishing
ISSN:0953-2048
Status:Published
Keywords:SNSPD, superconducting nanowires, current crowding
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Detectors for optical instruments (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:15 Mar 2021 14:11
Last Modified:15 Mar 2021 14:11

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