Abstract
We review the dominant processes that shape the optical nonlinearities of mesoscopic composite materials with particular emphasis on the photo-induced modifications of their spectral features that are related either to the electron or photon confinement in metal and semiconductor nanoparticles embedded in a transparent dielectric in low concentration. We also derive fluctuation–dissipation relations for the nonlinear regime in such systems. These modifications are related to the strong charge-photon coupling regime in confined space and can be exploited in different ways in applications and in particular as photonic nanoprobes with outstanding spatio-temporal resolution.
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