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Proceedings Paper

Spectral response of an infrared superconducting quantum detector
Author(s): Alexei D. Semenov; Andreas Engel; Heinz-Wilhelm Hübers; Konstantin Il'in; Michael Siegel
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Paper Abstract

We analyze the spectral performance of recently developed single-photon quantum detector that consists of a narrow, nanometer sized meander-line made from ultra-thin superconducting film. The detector exploits a combined detection mechanism, in which avalanche multiplication of quasiparticles after absorption of a single photon and the bias current jointly produce a normal domain that results in a voltage pulse developing between the meander ends. With either the wavelength increase or the bias current decrease, the single-photon detection regime exhibits a cut-off. The wavelength, at which the cut-off occurs, varies from infrared waves to visible light depending on the superconducting material and operation conditions. Structural and geometrical non-uniformities of the meander line smooth out the otherwise expected sharp drop of the detection efficiency beyond the cut-off. We refine the early detector model and propose a tentative explanation of how superconducting fluctuations may additionally extend the detection efficiency beyond the cut-off wavelength.

Paper Details

Date Published: 1 September 2004
PDF: 9 pages
Proc. SPIE 5459, Optical Sensing, (1 September 2004); doi: 10.1117/12.545080
Show Author Affiliations
Alexei D. Semenov, DLR (Germany)
Andreas Engel, DLR (Germany)
Heinz-Wilhelm Hübers, DLR (Germany)
Konstantin Il'in, Univ. Karlsruhe (Germany)
Michael Siegel, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 5459:
Optical Sensing
Brian Culshaw; Anna Grazia Mignani; Rainer Riesenberg, Editor(s)

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