16 June 2004 Ultrafast surface plasmon resonance Landau damping and electron kinetics in metal nanoparticles
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Ultrafast excitation of nonequilibrium quasi-free electrons by a femtosecond pulse and the first steps of their relaxation are studied in noble metal nanoparticles. Coherent electron-optical pulse coupling in or our of resonance with the surface plasmon resonance is shown to decay by single electron excitation (Landau damping) on a sub- 10 fs scale. This process is detected by monitoring transient depopulation of electron states well below the Fermi energy, in agreement with the free-electron optical absorption model. The subsequent loss of energy of the created nonequilibrium electron distribution show a particle size dependent slowing-down of the energy transfer to the lattice on a subpicosecond scale. These results are in quantitative agreement with numerical simulations of the athermal electron kinetics.
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Cyril Guillon, Cyril Guillon, Pierre Langot, Pierre Langot, Natalia Del Fatti, Natalia Del Fatti, Fabrice Vallee, Fabrice Vallee, } "Ultrafast surface plasmon resonance Landau damping and electron kinetics in metal nanoparticles", Proc. SPIE 5352, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII, (16 June 2004); doi: 10.1117/12.532218; https://doi.org/10.1117/12.532218

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