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Enhancement of Critical Currents and Photon Count Rates by Magnetic Field in Spiral Superconducting Nanowire Single-Photon Detectors

Charaev, Ilya and Semenov, Alexey and Lusche, Robert and Ilin, Konstantin and Hübers, Heinz-Wilhelm and Siegel, Michael (2016) Enhancement of Critical Currents and Photon Count Rates by Magnetic Field in Spiral Superconducting Nanowire Single-Photon Detectors. IEEE Transactions on Applied Superconductivity, 26 (3). IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TASC.2016.2528545 ISSN 1051-8223

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Abstract

We investigated the influence of magnetic fields on critical currents and photon-count rates for optical and near-infrared photons in spiral-shaped nanowire structures of different types. Nanowires with a width of about 100 nm were made in forms of square and circular spirals with a pitch of 150 nm. Magnetic field dependencies of the critical current in square spirals were asymmetric with respect to the field direction. In the current maximum, we achieved a more than 6 percent increase of the critical current. Contrary, circular spirals showed fully symmetric dependencies with the current maximum at zero magnetic field. Photon-count rates of spirals have been studied in the wavelength range from 500 to 1400 nm at magnetic fields up to 500 mT. In circular spirals, the rates of photon and dark counts were symmetric in magnetic fields at all achievable experimental conditions. In square spirals, dark and photon count rates are asymmetric with the minima occurring at opposite directions of the field. Dark count rates are lower than 10 cps at bias currents up to 90 percent of the critical value in the whole range of applied magnetic fields. Based on our results, we propose a way to decrease the minimum detectable photon flux by applying external magnetic field to the detector.

Item URL in elib:https://elib.dlr.de/110060/
Document Type:Article
Title:Enhancement of Critical Currents and Photon Count Rates by Magnetic Field in Spiral Superconducting Nanowire Single-Photon Detectors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Charaev, Ilyauniversity of karlsruheUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Lusche, Robertrobert.lusche (at) dlr.deUNSPECIFIED
Ilin, Konstantinuniversity of karlsruheUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Siegel, Michaeluniversität karlsruheUNSPECIFIED
Date:April 2016
Journal or Publication Title:IEEE Transactions on Applied Superconductivity
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:26
DOI :10.1109/TASC.2016.2528545
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:1051-8223
Status:Published
Keywords:Superconducting photodetectors, spirals, nanoscale devices, magnetic field measurement
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Aufbau und Aktualisierung eines DLR-Katalogs für Raumfahrtrückstande (Space Debris)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:05 Jan 2017 16:15
Last Modified:06 Sep 2019 15:18

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