Percolation and fractal composites: Optical studies

S. Ducourtieux, S. Grésillon, A. C. Boccara, J. C. Rivoal, X. Quelin, P. Gadenne, V. P. Drachev, W. D. Bragg, V. P. Safonov, V. A. Podolskiy, Z. C. Ying, R. L. Armstrong, Vladimir M. Shalaev

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Local field distributions arc studied in random metal-dielectric films near percolation (percolation films) and fractal aggregates of colloidal particles. For both systems, it is shown that optical excitations are localized in small nanometer-scale areas, "hot spots," where the local fields are much larger than the field of an incident electromagnetic wave. The large local fields result in giant enhancement of various optical phenomena. The surface-enhanced white-light generation and second-harmonic generation have been obtained in percolation films. For fractal aggregates of silver particles, a giant effect of local optical activity has been observed. The effect is due to surface-plasmon excitations localized on chiral-active particle configurations in fractals.

Original languageEnglish
Pages (from-to)105-116
Number of pages12
JournalJournal of Nonlinear Optical Physics and Materials
Volume9
Issue number1
DOIs
Publication statusPublished - 2000
Externally publishedYes

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