%0 Journal Article
%T Superconducting fast detector based on the nonequilibrium inductance response of a film of niobium nitride
%A Men’shchikov, E. M.
%A Gogidze, I. G.
%A Sergeev, A. V.
%A Elant’ev, A. I.
%A Kuminov, P. B.
%A Gol’tsman, G. N.
%A Gershenzon, E. M.
%J Tech. Phys. Lett.
%D 1997
%V 23
%N 6
%@ 1063-7850
%F Menshchikov_etal1997
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1593), last updated on Tue, 25 May 2021 21:18:54 -0500
%X A new type of fast detector is proposed, whose operation is based on the variation of the kinetic inductance of a superconducting film caused by nonequilibrium quasiparticles created by the electromagnetic radiation. The speed of the detector is determined by the rate of multiplication of photo-excited quasiparticles, and is nearly independent of the temperature, being less than 1 ps for NbN. Models based on the Owen-Scalapino scheme give a good description of the experimentally determined dependence of the power-voltage sensitivity of the detector on the modulation frequency. The lifetime of the quasiparticles is determined, and it is shown that the reabsorption of nonequilibrium phonons by the condensate has a substantial effect even in ultrathin NbN films 5 nm thick, and results in the maximum possible quantum yield. A low concentration of equilibrium quasiparticles and a high quantum yield result in a detectivity D*=1012 W−1·Hz1/2 at a temperature T=4.2 K and D*=1016 W−1·cm· Hz1/2 at T=1.6 K.
%K NbN KID
%R 10.1134/1.1261724
%U http://link.springer.com/10.1134/1.1261724
%U https://doi.org/10.1134/1.1261724
%P 486-488