We investigate the nonlinear optical response of thin gold films with an unprecedented combination of high temporal resolution (~15 fs) and broad spectral coverage. We quantitatively model the data without free parameters using an extended version of the two-temperature model. Our combined experimental and theoretical approach allows tracking the evolution from a purely nonthermal electron distribution towards a fully thermalized one. These results pose the basis for better understanding of light-matter interaction in metals on the ultrafast time scale. © 2012 American Physical Society.
Real-time optical mapping of the dynamics of nonthermal electrons in thin gold films
Longhi Stefano;Cerullo Giulio;
2012
Abstract
We investigate the nonlinear optical response of thin gold films with an unprecedented combination of high temporal resolution (~15 fs) and broad spectral coverage. We quantitatively model the data without free parameters using an extended version of the two-temperature model. Our combined experimental and theoretical approach allows tracking the evolution from a purely nonthermal electron distribution towards a fully thermalized one. These results pose the basis for better understanding of light-matter interaction in metals on the ultrafast time scale. © 2012 American Physical Society.File in questo prodotto:
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