PT Journal
AU Jukna, A
   Kitaygorsky, J
   Pan, D
   Cross, A
   Perlman, A
   Komissarov, I
   Sobolewski, R
   Okunev, O
   Smirnov, K
   Korneev, A
   Chulkova, G
   Milostnaya, I
   Voronov, B
   Gol'tsman, G
TI Dynamics of hotspot formation in nanostructured superconducting stripes excited with single photons
SO Acta Physica Polonica A
JI Acta Physica Polonica A
PY 2008
BP 955
EP 958
VL 113
IS 3
DI 10.12693/APhysPolA.113.955
DE SSPD; SNSPD
AB Dynamics of a resistive hotspot formation by near-infrared-wavelength single photons in nanowire-type superconducting NbN stripes was investigated. Numerical simulations of ultrafast thermalization of photon-excited nonequilibrium quasiparticles, their multiplication and out-diffusion from a site of the photon absorption demonstrate that 1.55 μm wavelength photons create in an ultrathin, two-dimensional superconducting film a resistive hotspot with the diameter which depends on the photon energy, and the nanowire temperature and biasing conditions. Our hotspot model indicates that under the subcritical current bias of the 2D stripe, the electric field penetrates the superconductor at the hotspot boundary, leading to suppression of the stripe superconducting properties and accelerated development of a voltage transient across the stripe.
ER