Authors

D. C. Kohlgraf-Owens;P. G. Kik

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

SMALL METAL PARTICLES; 3RD-ORDER OPTICAL NONLINEARITY; GOLD CLUSTERS; SUSCEPTIBILITY; FILMS; NANOPARTICLES; COMPOSITES; DISULFIDE; COLLOIDS; INDEX; Optics

Abstract

Maxwell Garnett effective medium theory is used to study the influence of silver nanoparticle induced field enhancement on the nonlinear response of a Kerr-type nonlinear host. We show that the composite nonlinear absorption coefficient, beta(c), can be enhanced relative to the host nonlinear absorption coefficient near the surface plasmon resonance of silver nanoparticles. This enhancement is not due to a resonant enhancement of the host nonlinear absorption, but rather due to a phase-shifted enhancement of the host nonlinear refractive response. The enhancement occurs at the expense of introducing linear absorption, alpha(c), which leads to an overall reduced figure of merit beta(c)/alpha(c) for nonlinear absorption. For thin ( < 1 mu m) composites, the use of surface plasmons is found to result in an increased nonlinear absorption response compared to that of the host material.

Journal Title

Optics Express

Volume

16

Issue/Number

14

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

10823

Last Page

10834

WOS Identifier

WOS:000257564100091

ISSN

1094-4087

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