We determined the third-order susceptibility [ χ (3)] of a thin composite film formed by silver nanoclusters embedded in soda-lime glass. Ag aggregation was promoted by irradiating an Ag-Na ion-exchanged glass with an N + beam. [ χ (3)] dispersion was measured by phase-mismatched degenerate four-wave mixing in the 380-470 nm spectral range, with 0.5 ps laser pulse duration. Close to the surface plasmon resonance of Ag metallic clusters, the χ (3) amplitude exceeds by a factor of 10 4 the value of substrate glass. We also measured a phase of 83° and a dynamics characterized by ∼ 30, 3 and 0.9 ps decay times, ascribed to hot-electrons-lattice thermalization in the clusters, followed by thermal diffusion toward the matrix and relaxation of the whole system to the starting temperature.

Measurement of the third order nonlinear susceptibility of Ag nanoparticles in glass in a wide spectral range

FACCIO, DANIELE FRANCO ANGEL;DI TRAPANI, PAOLO;
1998

Abstract

We determined the third-order susceptibility [ χ (3)] of a thin composite film formed by silver nanoclusters embedded in soda-lime glass. Ag aggregation was promoted by irradiating an Ag-Na ion-exchanged glass with an N + beam. [ χ (3)] dispersion was measured by phase-mismatched degenerate four-wave mixing in the 380-470 nm spectral range, with 0.5 ps laser pulse duration. Close to the surface plasmon resonance of Ag metallic clusters, the χ (3) amplitude exceeds by a factor of 10 4 the value of substrate glass. We also measured a phase of 83° and a dynamics characterized by ∼ 30, 3 and 0.9 ps decay times, ascribed to hot-electrons-lattice thermalization in the clusters, followed by thermal diffusion toward the matrix and relaxation of the whole system to the starting temperature.
Faccio, DANIELE FRANCO ANGEL; DI TRAPANI, Paolo; E., Borsella; F., Gonella; P., Mazzoldi; A. M., Malvezzi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11383/4878
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