Temperature-Dependence of Detection Efficiency in NbN and TaN SNSPD

We present systematic measurements of the temperature dependence of detection efficiencies in TaN and NbN superconducting nanowire single-photon detectors. We have observed a clear increase of the cut-off wavelength with decreasing temperature that we can qualitatively describe with a temperature-de...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.2300505-2300505
Main Authors: Engel, Andreas, Inderbitzin, Kevin, Schilling, Andreas, Lusche, Robert, Semenov, Alexei, Hubers, Heinz-Wilhelm, Henrich, Dagmar, Hofherr, Matthias, Il'in, Konstantin, Siegel, Michael
Format: Article
Language:English
Subjects:
Applied sciences
Critical current
Current measurement
Detectors
Electrical engineering. Electrical power engineering
Electronics
Exact sciences and technology
Materials
Optoelectronic devices
Photonics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconducting photodetectors
Temperature dependence
Temperature measurement
Wavelength measurement
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Summary:We present systematic measurements of the temperature dependence of detection efficiencies in TaN and NbN superconducting nanowire single-photon detectors. We have observed a clear increase of the cut-off wavelength with decreasing temperature that we can qualitatively describe with a temperature-dependent diffusion coefficient of the quasi-particles created after photon absorption. Furthermore, the detection efficiency at wavelengths shorter than the cut-off wavelength as well as at longer wavelengths exhibit distinct temperature dependencies. The underlying causes and possible consequences for microscopic detection models are discussed.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2013.2239345