PT Journal
AU Korneeva, Y
   Sidorova, M
   Semenov, A
   Krasnosvobodtsev, S
   Mitsen, K
   Korneev, A
   Chulkova, G
   Goltsman, G
TI Comparison of hot-spot formation in NbC and NbN single-photon detectors
SO IEEE Trans. Appl. Supercond.
JI IEEE Trans. Appl. Supercond.
PY 2016
BP 1
EP 4
VL 26
IS 3
DI 10.1109/TASC.2016.2526009
DE NbC; NbN SSPD; SNSPD
AB We report an experimental investigation of the hot-spot evolution in superconducting single-photon detectors made of disordered superconducting materials with different diffusivity and energy downconversion time values, i.e., 33-nm-thick NbN and 23-nm-thick NbC films. We have demonstrated that, in NbC film, only 405-nm photons produce sufficiently large hot spot to trigger a single-photon response. The dependence of detection efficiency on bias current for 405-nm photons in NbC is similar to that for 3400-nm photons in NbN. In NbC, large diffusivity and downconversion time result in 1-D critical current suppression profile compared with the usual 2-D profile in NbN.
ER