Double-band enhancement of effective third-order nonlinear susceptibility in gold-dielectric-gold multilayer nanoshells
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The effective third-order nonlinear susceptibility χ eff (3) of gold-dielectric-gold three-layer nanoshells was theoretically studied using the quasi-static approximation. Because of the physical origin from the SPR-induced local field enhancement, both the real and imaginary parts of the enhancement factor of χ eff (3) present maximum responses near the plasmon wavelengths. By altering the geometry parameters and local dielectric environment of the nanoshells, the intensity, wavelength position, and band number of the χ eff (3) could be fine tuned. The mode transformation of the χ eff (3) from single band to double band has been observed as the separate layer dielectric constant is increased or the inner gold sphere radius is increased. The band number of χ eff (3) also depends on the thickness of the outer gold shell. However, only single maximum response band of χ eff (3) could be observed when the shell thickness is too small or too large.
KeywordsThird-order nonlinear susceptibility Three-layered nanoshells Metal-dielectric nanostructure Surface plasmon resonance Double bands
This work was supported by the Fundamental Research Funds for the Central Universities under Grant No. 2011jdgz17 and the National Natural Science Foundation of China under grant No. 11174232.
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