Abstract
The effective third-order nonlinear susceptibility χ (3)eff 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 (3)eff 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 (3)eff could be fine tuned. The mode transformation of the χ (3)eff 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 (3)eff also depends on the thickness of the outer gold shell. However, only single maximum response band of χ (3)eff could be observed when the shell thickness is too small or too large.
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Acknowledgments
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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Zhu, J., Zhao, Sm. Double-band enhancement of effective third-order nonlinear susceptibility in gold-dielectric-gold multilayer nanoshells. J Nanopart Res 17, 249 (2015). https://doi.org/10.1007/s11051-015-3058-6
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DOI: https://doi.org/10.1007/s11051-015-3058-6