Theory of enhanced second-harmonic generation in some artificial materials |
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Authors: | Huang Ji-ping |
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Institution: | (1) Surface Physics Laboratory (National Key Laboratory) and Department of Physics, Fudan University, Shanghai, 200433, China |
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Abstract: | We review the recent theoretical investigation on enhanced second-harmonic generation (SHG) in soft nonlinear optical materials
based on ferrofluids, graded metallic films, and graded metal-dielectric films of anisotropic particles. The SHG of soft ferrofluid-based
nonlinear optical materials possess magnetic-field controllabilities, i.e., magnetic-field-controllable anisotropy, red-shift
and enhancement, which are caused to appear by the shift of a resonant plasmon frequency due to the formation of the chains
of the coated nanoparticles. Both graded metallic films and graded metal-dielectric films of anisotropic particles can serve
as a novel optical material for producing a broad structure in both the linear and SHG response and an enhancement in the
SHG signal, due to the local field effects.
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Keywords: | second harmonic generation soft nonlinear optical materials graded metallic films graded metal-dielectric films |
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