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Proceedings Paper

Improved energy resolution of a superconducting single-photon detector
Author(s): A. D. Semenov; P. Haas; H.-W. Hübers; K. S. Ilin; M. Siegel; A. Kirste; T. Schurig; R. Herrmann
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Paper Abstract

We demonstrated successful operation of an NbN single photon detector in the temperature range from 6 K to 1.2 K using a 3He sorption refrigerator combined with a pulse-tube mechanical cooler. The detector was read out either by microwave amplifiers or by a broadband SQUID-amplifier that limited the maximum counting rate to 107 counts per second. This counting rate was only one third of the maximum rate provided by the detector. Besides an increase in the quantum efficiency in the visible and near-infrared spectral range with the decrease of the operation temperature, we found a more than twofold improvement in the energy resolution as compared to earlier demonstrated 1 eV at 6.5 K. The noise equivalent power estimated at 4.2 K for visible light was better than 10-18 W Hz-1/2. We verified that the lowest achieved dark count rate was still caused by the harsh electrical conditions in the mechanical cooler.

Paper Details

Date Published: 22 July 2008
PDF: 7 pages
Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70211E (22 July 2008); doi: 10.1117/12.789351
Show Author Affiliations
A. D. Semenov, Institute of Planetary Research, German Aerospace Ctr. (DLR) (Germany)
P. Haas, Institute of Planetary Research, German Aerospace Ctr. (DLR) (Germany)
H.-W. Hübers, Institute of Planetary Research, German Aerospace Ctr. (DLR) (Germany)
K. S. Ilin, Univ. of Karlsruhe (Germany)
M. Siegel, Univ. of Karlsruhe (Germany)
A. Kirste, Physikalisch-Technische Bundesanstalt (Germany)
T. Schurig, Physikalisch-Technische Bundesanstalt (Germany)
R. Herrmann, Institute of Applied Photonics (Germany)


Published in SPIE Proceedings Vol. 7021:
High Energy, Optical, and Infrared Detectors for Astronomy III
David A. Dorn; Andrew D. Holland, Editor(s)

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