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Author
Il'in, K. S.
;
Gol'tsman, G. N.
;
Voronov, B. M.
;
Sobolewski, Roman
Title
Characterization of the electron energy relaxation process in NbN hot-electron devices
Type
Conference Article
Year
1999
Publication
Proc. 10
th
Int. Symp. Space Terahertz Technol.
Abbreviated Journal
Proc. 10
th
Int. Symp. Space Terahertz Technol.
Volume
Issue
Pages
390-397
Keywords
HEB mixers, SSPD, SNSPD, NbN films, Nb films
Abstract
We report on transient measurements of electron energy relaxation in NbN films with 300-fs time resolution. Using an electro-optic sampling technique, we have studied the photoresponse of 3.5-nm-thick NbN films deposited on sapphire substrates and exposed to 100-fs-wide optical pulses. Our experimental data analysis was based on the two-temperature model and has shown that in our films at the superconducting transition 10.5 K the inelastic electron-phonon scattering time was about (111}+-__.2) ps. This response time indicated that the maximum intermediate-frequency band of a NbN hot-electron phonon-cooled mixer should reach (16+41-3) GHz if one eliminates the bolometric phonon-heating effect. We have suggested several ways to increase the effectiveness of phonon cooling to achieve the above intrinsic value of the NbN mixer bandwidth.
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no
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1576
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