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Optical nonlinearity enhancement of graded metal-dielectric composite films

J. P. Huang, L. Dong, K. W. Yu

cond-mat.mtrl-sciarXiv:cond-mat/0407649

Abstract

We have derived the local electric field inside graded metal-dielectric composite films with weak nonlinearity analytically, which further yields the effective linear dielectric constant and third-order nonlinear susceptibility of the graded structures. As a result, the composition-dependent gradation can produce 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.

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