Evidence for the spectral dependence of nonequilibrium picosecond photoresponse of YBaCuO thin films

The transient voltage photoresponse of current biased YBaCuO thin films to 20 ps laser pulses of 0.63 and 1.54 μm wavelengths is measured for temperatures around the superconducting transition region. The fast picosecond decay of the response is followed by a slow nanosecond relaxation which is asso...

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Veröffentlicht in:Applied physics letters 1993-08, Vol.63 (5), p.681-683
Hauptverfasser: Semenov, A. D., Goghidze, I. G., Gol’tsman, G. N., Sergeev, A. V., Gershenzon, E. M.
Format: Artikel
Sprache:eng
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Zusammenfassung:The transient voltage photoresponse of current biased YBaCuO thin films to 20 ps laser pulses of 0.63 and 1.54 μm wavelengths is measured for temperatures around the superconducting transition region. The fast picosecond decay of the response is followed by a slow nanosecond relaxation which is associated with the bolometric effect. The magnitude of the fast component of the response varies in proportion to the square root of wavelength that plausibly reflects multiplication processes of photoexcited electrons via electron–electron scattering and interaction with high energy phonons.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.109928