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Regular version of the site

Article

NbN single-photon detectors with saturated dependence of quantum efficiency

Superconductor Science and Technology. 2018. Vol. 31. No. 3. P. 1-7.
Smirnov K., Divochiy A., Vakhtomin Y., Morozov P., Золотов Ф. И., Antipov A., Seleznev V.

The possibility of creating NbN superconducting single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current was investigated. It was shown that the saturation increases for the detectors based on finer films with a lower value of R s300/R s20. The decreasing of R s300/R s20 was related to the increasing influence of quantum corrections to conductivity of superconductors and, in turn, to the decrease of the electron diffusion coefficient. The best samples have a constant value of system QE 94% at I b /I c ~ 0.8 and wavelength 1310 nm.