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Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content

Henrich, Dagmar and Dörner, S. and Hofherr, M. and Ilin, Konstantin and Semenov, A. and Heintze, E. and Scheffler, M. and Dressel, M. and Siegel, Michael (2012) Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content. Journal of Applied Physics, 112 (074511), pp. 1-8. American Institute of Physics (AIP). DOI: 10.1063/1.4757625

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Abstract

The spectral detection efficiency and the dark count rate of superconducting nanowire single-photon detectors (SNSPD) have been studied systematically on detectors made from thin NbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nm thick NbN films results in a decrease of the dark count rates more than two orders of magnitude and in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observed phenomena are explained by an improvement of uniformity of NbN films that has been confirmed by a decrease of resistivity and an increase of the ratio of the measured critical current to the depairing current. The latter factor is considered as the most crucial for both the cut-off wavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteria for material properties to optimize SNSPD in the infrared spectral region.

Item URL in elib:https://elib.dlr.de/78817/
Document Type:Article
Title:Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Henrich, DagmarInstitut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIED
Dörner, S.Institut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIED
Hofherr, M.Institut für Mikro- und Nanoelektronische Systeme (IMS), Karlsruher Institut für Technolgie (KIT), Hertzstrasse 16, 76187 Karlsruhe, GermanyUNSPECIFIED
Ilin, KonstantinUniversity of KarlsruheUNSPECIFIED
Semenov, A.alexei.semenov (at) dlr.deUNSPECIFIED
Heintze, E.Physikalisches Institut, Universit€at Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyUNSPECIFIED
Scheffler, M.Physikalisches Institut, Universit€at Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyUNSPECIFIED
Dressel, M.1. Physikalisches Institut, Uni-StuttgartUNSPECIFIED
Siegel, MichaelUniversität KarlsruheUNSPECIFIED
Date:October 2012
Journal or Publication Title:Journal of Applied Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:112
DOI :10.1063/1.4757625
Page Range:pp. 1-8
Publisher:American Institute of Physics (AIP)
Status:Published
Keywords:single photon detection, NbN nanowire, Nitrogen stoichiometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben IR-Sensorik, IR-Missionsprojekte
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:11 Dec 2012 14:07
Last Modified:18 Dec 2019 04:19

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