TY  - JOUR
AU  - Semenov, A. D.
AU  - Heusinger, M. A.
AU  - Renk, K. F.
AU  - Menschikov, E.
AU  - Sergeev, A. V.
AU  - Elant'ev, A. I.
AU  - Goghidze, I. G.
AU  - Gol'tsman, G. N.
PY  - 1997
DA  - 1997//
TI  - Influence of phonon trapping on the performance of NbN kinetic inductance detectors
T2  - IEEE Trans. Appl. Supercond.
JO  - IEEE Trans. Appl. Supercond.
SP  - 3083
EP  - 3086
VL  - 7
IS  - 2
KW  - NbN KID
AB  - 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.
SN  - 1051-8223
UR  - http://ieeexplore.ieee.org/document/621984/
UR  - https://doi.org/10.1109/77.621984
DO  - 10.1109/77.621984
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1598), last updated on Tue, 25 May 2021 21:50:29 -0500
ID  - Semenov_etal1997
ER  -