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.
Real-time optical mapping of the dynamics of nonthermal electrons in thin gold films
DELLA VALLE, GIUSEPPE;LONGHI, STEFANO;CERULLO, GIULIO NICOLA;BRIDA, DANIELE
2012-01-01
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.File in questo prodotto:
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