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Enhancement of χ3 in nanoparticle composite media exhibiting electrostriction and quantum confinement

Abstract A new model is described that combines the interaction between two physical mechanisms responsible for bulk third-order optical nonlinearity. They are: (1) saturable absorption, due to quantum confinement in nanoparticles, and (2) electrostriction, causing particles to migrate in the fluid host. We show that enhanced nonlinearities are predicted resulting from local field coupling and that oscillations can occur under certain conditions.