Superconducting nanowire single-photon detectors: Quantum efficiency vs. film thickness

M. Hofherr, D. Rall, K. S. Ilin, A. Semenov, N. Gippius, H. W. Hübers, M. Siegel

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The quantum efficiency of superconducting nanowire single-photon detectors has been systematically studied in a broad spectral range from near ultra-violet to near infrared radiation. Detectors were made from NbN films on sapphire substrates and had thicknesses between 4 and 12 nm. The gradual reduction of the quantum efficiency with increasing wavelength is caused by a crossover from the "hot-spot" to the "vortex" detection scenario. For thicker films the wavelength demarcating the two regimes shifts to shorter wavelengths.

Original languageEnglish
Article number012017
JournalJournal of Physics: Conference Series
Issue numberPART 1
Publication statusPublished - 2010
Externally publishedYes


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