%0 Journal Article
%T Influence of phonon trapping on the performance of NbN kinetic inductance detectors
%A Semenov, A. D.
%A Heusinger, M. A.
%A Renk, K. F.
%A Menschikov, E.
%A Sergeev, A. V.
%A Elant'ev, A. I.
%A Goghidze, I. G.
%A Gol'tsman, G. N.
%J IEEE Trans. Appl. Supercond.
%D 1997
%V 7
%N 2
%@ 1051-8223
%F Semenov_etal1997
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1598), last updated on Tue, 25 May 2021 21:50:29 -0500
%X Voltage and microwave photoresponse of NbN thin films to modulated and pulsed optical radiation reveals, far below the superconducting transition, a response time consistent with the lifetime of nonequilibrium quasiparticles. We show that even in 5 nm thick films at 4.2 K the phonon trapping is significant resulting in a quasiparticle lifetime of a few nanoseconds that is an order of magnitude larger than the recombination time. Values and temperature dependence of the quasiparticle lifetime obey the Bardeen-Cooper-Schrieffer theory and are in quantitative agreement with the electron-phonon relaxation rate determined from the resistive response near the superconducting transition. We discuss a positive effect of the phonon trapping on the performance of kinetic inductance detectors.
%K NbN KID
%R 10.1109/77.621984
%U http://ieeexplore.ieee.org/document/621984/
%U https://doi.org/10.1109/77.621984
%P 3083-3086