Nonlinear susceptibility of a metal-dielectric nanocomposite caused by induced dipole-dipole forces between particles

S. V. Perminov, V. P. Drachev

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The optical coefficients of a nonlinearity for a macroscopic ensemble of aggregates of metal nanoparticles that is caused by deformation of the spatial structure of clusters in a strong light field are calculated for the first time. For a continuous medium that consists of a nonabsorbing dielectric containing aggregated silver nanoparticles that do not possess an intrinsic optical nonlinearity, coefficients of nonlinear absorption are obtained in relation to the intensity and frequency of incident light. It is shown that, at intensities of up to a few megawatts per square centimeter, the addition to the absorption of a nanocomposite to be modeled is adequately described by a third-order nonlinearity. The magnitude and sign of the nonlinear absorption coefficient agree well with the previously obtained experimental data for aggregated silver and gold colloids under nanosecond excitation.

Original languageEnglish
Pages (from-to)987-992
Number of pages6
JournalOptics and Spectroscopy
Volume107
Issue number6
DOIs
Publication statusPublished - Dec 2009
Externally publishedYes

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