Volume 43, Number 2, July II 1998
|Page(s)||213 - 218|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Measurement of the third-order nonlinear susceptibility of Ag nanoparticles in glass in a wide spectral range
Second Faculty of Sciences, Università di Milano - 22100
2 INFM, Istituto di Scienze Matematiche, Fisiche e Chimiche, Università di Milano 22100 Como, Italy
3 INFM, Dipartimento di Fisica, Università di Padova Via Marzolo 8, 35131 Padova, Italy
4 INFM, Dipartimento di Elettronica, Università di Pavia - Pavia, Italy
Accepted: 25 May 1998
We determined the third-order susceptibility 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 beam. 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 amplitude exceeds by a factor of 104 the value of substrate glass. We also measured a phase of and a dynamics characterized by , 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.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 78.66.-w – Optical properties of specific thin films, surfaces, and low-dimensional structures: superlattices, quantum well structures, multilayers, and microparticles / 42.65.-k – Nonlinear optics
© EDP Sciences, 1998
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