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Current dependence of the hot-spot response spectrum of superconducting single-photon detectors with different layouts

Charaev, Ilya and Semenov, Alexey and Doerner, Stefan and Gomard, G and Ilin, Konstantin and Siegel, Michael (2016) Current dependence of the hot-spot response spectrum of superconducting single-photon detectors with different layouts. Superconductor Science & Technology, 30, 025016. Institute of Physics (IOP) Publishing. DOI: 10.1088/1361-6668/30/2/025016 ISSN 0953-2048

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Official URL: http://iopscience.iop.org/article/10.1088/1361-6668/30/2/025016/meta

Abstract

We show that avoiding bends in a current-carrying superconducting nanowire enhances the probability for low energy photons to be detected and that this enhancement is entirely due to the increase in the experimentally achievable critical current. We studied nanowires shaped as either meander or spiral. The spirals had different layouts, a double-spiral layout with an S-turn in the middle and a single-spiral layout without such a turn. Nanowires were prepared from films of niobium nitride with a thickness of 5 nm. For specimens with each layout we measured the spectra of the single-photon response in the wavelength range from 400 nm to 1600 nm and defined the cut-off wavelength (λc) beyond which the response rolls off. The largest and the smallest λc were found for the single-spiral layout and for the meander, respectively. For all three layouts the relationship between λc and the relative bias current falls onto a universal curve which has been predicted earlier in the framework of the modified hot-spot model. For the single-spiral layout, the efficiency of photon detection at wavelengths smaller than λc reaches the expected absorbance of the spiral structure and the timing jitter per unit length of the nanowire has the smallest value.

Item URL in elib:https://elib.dlr.de/110061/
Document Type:Article
Title:Current dependence of the hot-spot response spectrum of superconducting single-photon detectors with different layouts
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Charaev, Ilyauniversity of karlsruheUNSPECIFIED
Semenov, AlexeyAlexei.Semenov (at) dlr.deUNSPECIFIED
Doerner, Stefanuniversity of KarlsruheUNSPECIFIED
Gomard, Guniversity of KarlsruheUNSPECIFIED
Ilin, Konstantinuniversity of karlsruheUNSPECIFIED
Siegel, Michaeluniversität karlsruheUNSPECIFIED
Date:23 December 2016
Journal or Publication Title:Superconductor Science & Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:30
DOI :10.1088/1361-6668/30/2/025016
Page Range:025016
Publisher:Institute of Physics (IOP) Publishing
ISSN:0953-2048
Status:Published
Keywords:superconducting detectors, nanostructures, detection efficiency, jitter, nanofabrication, single-photon detector
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 16:16
Last Modified:06 Sep 2019 15:21

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