Double-band enhancement of effective third-order nonlinear susceptibility in gold-dielectric-gold multilayer nanoshells

作者：Zhu Jian^*; Zhao Shu min

来源：Journal of Nanoparticle Research, 2015, 17(6): 249.

DOI：10.1007/s11051-015-3058-6

• Third-order nonlinear susceptibility
• Three-layered nanoshells
• Metal-dielectric nanostructure
• Surface plasmon resonance
• Double bands

The effective third-order nonlinear susceptibility chi((3))(eff) of gold-dielectric-gold three-layer nanoshells was theoretically studied using the quasistatic approximation. Because of the physical origin from the SPR-induced local field enhancement, both the real and imaginary parts of the enhancement factor of chi((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 chi((3))(eff) could be fine tuned. The mode transformation of the chi((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 chi((3))(eff) also depends on the thickness of the outer gold shell. However, only single maximum response band of chi((3))(eff) could be observed when the shell thickness is too small or too large.

• 出版日期2015-6-4
• 单位西安交通大学