Optical nonlinearity enhancement of graded metallic films

Details Optical nonlinearity enhancement of graded metallic films Optical nonlinearity enhancement of graded metallic films

2004-05-19

arxiv.org/abs/cond-mat/0405427v1

Appl. Phys. Lett. 85, 94 (2004)

Physics

Condensed Matter

Materials Science

11 pages, 2 eps figures, submitted to Applied Physics Letters

Scientific paper

10.1063/1.1769086

The effective linear and third-order nonlinear susceptibility of graded metallic films with weak nonlinearity have been investigated. Due to the simple geometry, we were able to derive exactly the local field inside the graded structures having a Drude dielectric gradation profile. We calculated the effective linear dielectric constant and third-order nonlinear susceptibility. We investigated the surface plasmon resonant effect on the optical absorption, optical nonlinearity enhancement, and figure of merit of graded metallic films. It is found that the presence of gradation in metallic films yields a broad resonant plasmon band in the optical region, resulting in a large enhancement of the optical nonlinearity and hence a large figure of merit. We suggest experiments be done to check our theoretical predictions, because graded metallic films can be fabricated more easily than graded particles.

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