Ultrafast cooling of electronic subsystem in ultrathin metal films

V. M. Petnikova; K. V. Rudenko; Vladimir V. Shuvalov

doi:10.1117/12.469101

29 May 2002 Ultrafast cooling of electronic subsystem in ultrathin metal films

V. M. Petnikova, K. V. Rudenko, Vladimir V. Shuvalov

Proceedings Volume 4752, ICONO 2001: Ultrafast Phenomena and Strong Laser Fields; (2002) https://doi.org/10.1117/12.469101
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus

Abstract

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.

Citation Download Citation

V. M. Petnikova, K. V. Rudenko, and Vladimir V. Shuvalov "Ultrafast cooling of electronic subsystem in ultrathin metal films", Proc. SPIE 4752, ICONO 2001: Ultrafast Phenomena and Strong Laser Fields, (29 May 2002); https://doi.org/10.1117/12.469101

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