Abstract

We review the impact of electron confinement on the optical nonlinearities and electron dynamics in metal nanocrystals in glasses. The main contribution to the optical Kerr nonlinearity results from the photoinduced redistribution of electron population close to the Fermi level, a hot electron contribution, enchanced by the morphological surface plasmon resonance. The electron dynamics in these nanocrystals are also analysed in the light of recent studies using time resolved nonlinear optical techniques in the femtosecond time scale and it is shown that the dielectric confinement and the Fermi statistics have a major impact on the interplay of electron-electron and electron-phonon interactions.

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