Volume 67, Number 5, September 2004
|Page(s)||854 - 858|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2004|
Optical nonlinearity enhancement of graded metal-dielectric composite films
Department of Physics, The Chinese University of Hong Kong Shatin, NT, Hong Kong
2 Max Planck Institute for Polymer Research - Ackermannweg 10 55128 Mainz, Germany
3 Biophysics and Statistical Mechanics Group, Laboratory of Computational Engineering, Helsinki University of Technology - P.O. Box 9203 FIN-02015 HUT, Finland
Accepted: 15 June 2004
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.
PACS: 77.22.Ej – Polarization and depolarization / 42.65.An – Optical susceptibility, hyperpolarizability / 42.79.Ry – Gradient-index (GRIN) devices
© EDP Sciences, 2004
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