Percolation and fractal composites:: Optical studies

被引：29

作者：

Ducourtieux, S ^{[1
]}

Grésillon, S

Boccara, AC

Rivoal, JC

Quelin, X

Gadenne, P

Drachev, VP

Bragg, WD

Safonov, VP

Podolskiy, VA

Ying, ZC

Armstrong, RL

Shalaev, VM

机构：

[1] Univ Paris 06, ESPCI, Lab Opt Phys, F-75231 Paris, France

[2] Univ Versailles, CNRS, UMR 8634, LMOV, F-78035 Versailles, France

[3] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[4] Russian Acad Sci, Inst Semicond Phys, Novosibirsk 630090, Russia

[5] Russian Acad Sci, Inst Automat & Electrometry, Novosibirsk 630090, Russia

来源：

JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS | 2000年 / 9卷 / 01期

关键词：

D O I：

10.1142/S0218863500000108

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Local field distributions are 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.

引用

页码：105 / 116

页数：12

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