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Proceedings Paper

Energy resolution of a superconductor quantum detector
Author(s): Alexei Semenov; Andreas Engel; Heinz-Wilhelm Hubers; Konstantin Il'in; Michael Siegel
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Paper Abstract

We report on the energy resolution of a recently developed superconductor single-photon quantum detector. In a superconducting strip quasiparticles created by a single absorbed photon and a bias current jointly cause a normal domain and, subsequently, a voltage transient that manifests absorption of the photon. Given a constant optical coupling, the mechanism suggests a moderate to good energy resolution in the wavelength range from near-infrared to X-rays. We implemented a meander line from a 80-nm wide and 5-nm thick NbN strip to detect single near-infrared photons with the repetition rate 5•107 sec-1 and quantum efficiency of few per cent. Although with this detector operated at 2 K we have indeed observed photon-energy dependent detector response, the energy resolving capability appeared smaller than the detector model predicted. We suggest that the inconsistency owes to the influence of the bias current.

Paper Details

Date Published: 29 September 2004
PDF: 6 pages
Proc. SPIE 5499, Optical and Infrared Detectors for Astronomy, (29 September 2004); doi: 10.1117/12.552578
Show Author Affiliations
Alexei Semenov, DLR Institute for Planetary Research (Germany)
Andreas Engel, DLR Institute for Planetary Research (Germany)
Heinz-Wilhelm Hubers, DLR Institute for Planetary Research (Germany)
Konstantin Il'in, Univ. Karlsruhe (Germany)
Michael Siegel, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 5499:
Optical and Infrared Detectors for Astronomy
James D. Garnett; James W. Beletic, Editor(s)

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