PT Unknown
AU Korneeva, YP
   Vodolazov, DY
   Semenov, AV
   Florya, IN
   Simonov, N
   Baeva, E
   Korneev, AA
   Goltsman, GN
   Klapwijk, TM
TI Optical single photon detection in micron-scaled NbN bridges
PY 2018
DE SSPD
AB 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 % of 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 modelling based on the theory of non-equilibrium superconductivity including the vortex-assisted mechanism of initial dissipation.
ER