Does femtosecond time-resolved second-harmonic generation probe electron temperatures at surfaces?

Details Does femtosecond time-resolved second-harmonic generation probe electron temperatures at surfaces? Does femtosecond time-resolved second-harmonic generation probe electron temperatures at surfaces?

1997-07-11

arxiv.org/abs/cond-mat/9707118v1

Appl. Phys. B 63, 541-544 (1996)

Physics

Condensed Matter

11 pages, 4 figures

Scientific paper

Femtosecond pump-probe second-harmonic generation (SHG) and transient linear reflectivity measurements were carried out on polycrystalline Cu, Ag and Au in air to analyze whether the electron temperature affects Fresnel factors or nonlinear susceptibilities, or both. Sensitivity to electron temperatures was attained by using photon energies near the interband transition threshold. We find that the nonlinear susceptibility carries the electron temperature dependence in case of Ag and Au, while for Cu the dependence is in the Fresnel factors. This contrasting behavior emphasizes that SHG is not a priori sensitive to electron dynamics at surfaces or interfaces, notwithstanding its cause.

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