Cubic nonlinearities in small-particle composites: local-field induced giant enhancements

D. Stroud and X. Zhang

Physica A: Statistical Mechanics and its Applications, 1994, vol. 207, issue 1, 55-64

Abstract: We discuss methods for enhancing the cubic nonlinear susceptibility χe of a composite material, starting from an exact relation between χe and the fourth moment of the electric field in the related linear composite. At zero frequencies, in a random metal-insulator composite, χe can be greatly enhanced near a percolation threshold. Similar enhancement is obtained when a linear fractal is embedded in a nonlinear host. In a random Drude metal-insulator composite χe is greatly enhanced near surface-plasmon resonances; the enhancement shows very strong structure which is nearly undetectable in the linear response. In a suspension of spheres coated with a nonlinear material, χe/χcoat ⪢ 1 near the surface-plasmon resonance frequency of the core particle.

Date: 1994
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:207:y:1994:i:1:p:55-64

DOI: 10.1016/0378-4371(94)90354-9

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