Superconducting single-photon detector for the visible and infrared spectral range

Authors: A. Engel1; A. Semenov1; H.-W. Hübers1; K. Il'in2; M. Siegel2

Source: Journal of Modern Optics, Volume 51, Numbers 9-10, 15 June-10 July 2004 , pp. 1459-1466(8)

Publisher: Taylor and Francis Ltd

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Abstract:

We present results on dark count rates and spectral sensitivities of superconducting single-photon detectors in the visible and near-infrared spectral range. The active detector element is a nanometre-sized (a few nanometres thick and less than 100 nm wide) meander line carrying a supercurrent. The superconducting materials are NbN and Nb, respectively. The NbN detector exhibited a flat spectral sensitivity up to about 2.4 mum. Fluctuations of the superconducting order parameter are considered as a major source of dark count events. A simple model and its limitations to explain the observed dark count rates is discussed.

Document Type: Research article

DOI: 10.1080/09500340410001670802

Affiliations: 1: DLR Institute of Planetary Research Rutherfordstr. 2 12489 Berlin Germany 2: Institute of Micro- and Nanoelectronic Systems University of Karlsruhe Hertzstr. 16 76187 Karlsruhe Germany

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