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Magnetic-Field Enhancement of Performance of Superconducting Nanowire Single-Photon Detector

Charaev, Ilya and Semenov, Alexey and Ilin, K. and Siegel, M. (2019) Magnetic-Field Enhancement of Performance of Superconducting Nanowire Single-Photon Detector. IEEE Transactions on Applied Superconductivity, 29 (5), e2200605. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TASC.2019.2898001 ISSN 1051-8223

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We present SNSPDs from NbN nanowires shaped after square-spiral, that allows an increase not only in critical currents, but also an extension of spectral detection efficiencies by just applying an external magnetic field. Using negative electron-beam lithography with the positive resist for shaping nanowires made it possible to reduce the inner bend radius. Consequently, the effect of critical-current enhancement in the magnetic field becomes stronger than it was demonstrated earlier. Here we achieved a 13% increase of the critical current in the magnetic field. We measured the spectra of the single-photon detection efficiency in the wavelength ranging from 400 to 1100 nm in the magnetic field. At zero field, the square-spiral has the spectrum similar to that of a meander. At the field providing the maximum of the critical current, the detection efficiency and the cutoff wavelength in the spectrum increase by 20% and by 54%, respectively. The magnetic-field dependence of the dark count rate is well described by the proposed analytical model.

Item URL in elib:https://elib.dlr.de/133314/
Document Type:Article
Title:Magnetic-Field Enhancement of Performance of Superconducting Nanowire Single-Photon Detector
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Charaev, IlyaUniversity of KarlsruheUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Ilin, K.Institute of Micro- and Nanosystems, University of KarlsruheUNSPECIFIED
Siegel, M.Institute of Micro- and Nanosystems, University of KarlsruheUNSPECIFIED
Date:August 2019
Journal or Publication Title:IEEE Transactions on Applied Superconductivity
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/TASC.2019.2898001
Page Range:e2200605
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Nanowires, superconducting devices, magnetic field, single-photon detector, critical current
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 Optische Technologien und Anwendungen
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:08 Jan 2020 09:18
Last Modified:08 Jan 2020 09:18

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