Second Harmonic Generation for a Dilute Suspension of Coated Particles

Details Second Harmonic Generation for a Dilute Suspension of Coated Particles Second Harmonic Generation for a Dilute Suspension of Coated Particles

2003-12-01

arxiv.org/abs/cond-mat/0312049v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

11 pages, 3 figures; accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.014203

We derive an expression for the effective second-harmonic coefficient of a dilute suspension of coated spherical particles. It is assumed that the coating material, but not the core or the host, has a nonlinear susceptibility for second-harmonic generation (SHG). The resulting compact expression shows the various factors affecting the effective SHG coefficient. The effective SHG per unit volume of nonlinear coating material is found to be greatly enhanced at certain frequencies, corresponding to the surface plasmon resonance of the coated particles. Similar expression is also derived for a dilute suspension of coated discs. For coating materials with third-harmonic (THG) coefficient, results for the effective THG coefficients are given for the cases of coated particles and coated discs.

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