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Regular version of the site

Article

Optical single-photon detection in micrometer-scale NbN bridges

Physical Review Applied. 2018. Vol. 9. No. 6. P. 064037-1-064037-13.
Korneeva Y., Vodolazov D. Y., Semenov A. V., Florya I., Simonov N., E. Baeva, Korneev A., Goltsman G., Klapwijk T. M.

We demonstrate experimentally that single photon detection can be achieved in micron-wide NbN bridges, with widths ranging from 0.53\,μm to 5.15\,μm and for photon-wavelengths from 408\,nm to 1550\,nm. The microbridges are biased with a dc current close to the experimental critical current, which is estimated to be about 50\the theoretically expected depairing current. These results offer an alternative to the standard superconducting single-photon detectors (SSPDs), based on nanometer scale nanowires implemented in a long meandering structure. The results are consistent with improved theoretical modeling based on the theory of non-equilibrium superconductivity including the vortex-assisted mechanism of initial dissipation.