We report time-resolved characterization of superconducting NbN hot-electron photodetectors using an electro-optic sampling method. Our samples were patterned into micron-size microbridges from 3.5-nm-thick NbN films deposited on sapphire substrates. The devices were illuminated with 100 fs optical pulses, and the photoresponse was measured in the ambient temperature range between 2.15 and 10.6 K (superconducting temperature transition The experimental data agreed very well with the nonequilibrium hot-electron, two-temperature model. The quasiparticle thermalization time was ambient temperature independent and was measured to be 6.5 ps. The inelastic electron–phonon scattering time tended to decrease with the temperature increase, although its change remained within the experimental error, while the phonon escape time decreased almost by a factor of two when the sample was put in direct contact with superfluid helium. Specifically, and fitted by the two-temperature model, were equal to 11.6 and 21 ps at 2.15 K, and and 38 ps at 10.5 K, respectively. The obtained value of shows that the maximum intermediate frequency bandwidth of NbN hot-electron phonon-cooled mixers operating at can reach GHz if one eliminates the bolometric phonon-heating effect.
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8 May 2000
Research Article|
May 08 2000
Picosecond hot-electron energy relaxation in NbN superconducting photodetectors
K. S. Il’in;
K. S. Il’in
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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M. Lindgren;
M. Lindgren
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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M. Currie;
M. Currie
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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A. D. Semenov;
A. D. Semenov
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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G. N. Gol’tsman;
G. N. Gol’tsman
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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Roman Sobolewski;
Roman Sobolewski
Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231
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S. I. Cherednichenko;
S. I. Cherednichenko
Department of Physics, Moscow State Pedagogical University, Moscow 119435, Russia
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E. M. Gershenzon
E. M. Gershenzon
Department of Physics, Moscow State Pedagogical University, Moscow 119435, Russia
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Appl. Phys. Lett. 76, 2752–2754 (2000)
Article history
Received:
October 25 1999
Accepted:
March 14 2000
Citation
K. S. Il’in, M. Lindgren, M. Currie, A. D. Semenov, G. N. Gol’tsman, Roman Sobolewski, S. I. Cherednichenko, E. M. Gershenzon; Picosecond hot-electron energy relaxation in NbN superconducting photodetectors. Appl. Phys. Lett. 8 May 2000; 76 (19): 2752–2754. https://doi.org/10.1063/1.126480
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