Intrinsic detection efficiency of superconducting nanowire single-photon detectors with different thicknesses
Hofherr, Mattias and Rall, Dagmar and Ilin, Konstantin and Siegel, Michael and Semenov, Alexej and Hübers, H.-W. and Gippius, Nikolay (2010) Intrinsic detection efficiency of superconducting nanowire single-photon detectors with different thicknesses. Journal of Applied Physics, 108 (014507). DOI: 10.1063/1.3437043.
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We evaluate experimentally the intrinsic detection efficiency IDE of superconducting NbN nanowire single-photon detectors in the range of wire thicknesses from 4 to 12 nm. The study is performed in the broad spectral interval between near-ultraviolet wavelength 400 nm and near-infrared wavelength 2000 nm light with plane waves at normal incidence. For visible light the IDE of the thinnest detectors reaches 70%. We use numerically computed absorptance of the nanowire-structures for the analysis of the experimental data. Variations in the detection efficiency with both the wire thickness and the wavelength evidence the red boundary of the hot-spot photon-detection mechanism. We explain the detection at larger wavelengths invoking thermal excitation of magnetic Pearl vortices over the potential barrier at the edges of the wire.
|Title:||Intrinsic detection efficiency of superconducting nanowire single-photon detectors with different thicknesses|
|Journal or Publication Title:||Journal of Applied Physics|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Keywords:||Superconducting nanowiers, photon detection, Pearl vortices|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|Institutes and Institutions:||Institute of Planetary Research > Terahertz and Infrared Sensors|
|Deposited By:||Prof.Dr. Alexey Semenov|
|Deposited On:||10 Jan 2011 09:37|
|Last Modified:||07 Feb 2013 20:28|
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