Abstract
We investigate the effect of geometric anisotropy on optical nonlinearity enhancement for composites with metal elliptical cylinders periodically in an insulation host. Based on the Stroud–Hui relation and a series expression of the space-dependent electric field in periodic composites, the frequency dependences of the effective nonlinear susceptibility are calculated. The results show that for the metal-insulator composites, the nonlinearity enhancement increases almost to its maximum when a structure with layers of fluctuating thicknesses forms, and exhibits a local minimum at the percolation threshold. We also conclude that the nonlinearity enhancement reaches its maximum when composites with elliptical inclusions are transformed into Boyd–Sipe-type layered composites.
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