Abstract
The influence of hot electrons on a permittivity of noble metals is studied. For this purpose, a multicomponent model of the permittivity of noble metals in a two-temperature state is developed for the visible and near IR spectrum. In addition to the Drude component of the permittivity describing the response of conduction band electrons in the IR range, the model includes components associated with the d-band structure and describing the response of valence electrons. Time-resolved interferometric studies of the transient optical properties of gold in a strongly nonequilibrium state during ∼10–13–10–11 s after the irradiation by femtosecond laser pulses are carried out. The results of the measurement of the dynamics of the complex reflectivity of gold at the wavelengths of 800, 620, and 400 nm in the vicinity of ablation threshold are in good agreement with the results of modeling. It is shown that valence d-band electrons in gold start playing a significant role in the behavior of the permittivity in the visible and near IR spectral range if the temperature of hot electrons exceeds 3 kK.
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