16 June 2004 Ultrafast surface plasmon resonance Landau damping and electron kinetics in metal nanoparticles
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Abstract
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, Pierre Langot, Natalia Del Fatti, 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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