Ultra-fast cooling of electronic subsystem in ultra-thin metal films

Авторы: Petnikova V.M., Rudenko K.V., Shuvalov V.V.
Сборник: ICONO’01, Ultrafast Phenomena and Strong Laser Fields
Том: 4752
Год издания: 2002
Место издания: SPIE
Первая страница: 124
Последняя страница: 129
DOI: 10.1117/12.469101
Аннотация: On the basis of experimental data of degenerate four-photon spectroscopy of Ni, Au and Pt ultra-thin (with the thickness approximately 10 divided by 20 nm) films, a conclusion about a predominant role of inter-band electronic transitions under formation of a nonlinear response of such films in the visible range has been made. It has been shown that, when a metal film thickness is smaller than the mean-free path, thermalization and cooling of optically excited electronic subsystem result from an ultra-fast inelastic scattering of excess free carriers on the film surface. Numerical estimations, performed for ultra-thin Ni films, have shown that, thanks to this scattering process, up to 10% of picosecond (duration approximately 20 ps) pump pulse energy can be transformed to the surface deformations. In case of spatially non-uniform optical excitation, an efficient direct generation of the surface acoustical waves can be realized.
Добавил в систему: Шувалов Владимир Владимирович

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