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基于Mie散射理论研究了金壳厚度变化、内核尺寸变化及内核介质变化下金纳米球壳的吸收光谱.研究发现,随着金壳厚度的增加,颗粒光学吸收增加到最大值后逐渐降低;随着内核尺寸逐渐增加,金壳颗粒的光学吸收最大值逐渐减小.此外,还发现随着内核介电常数的增大,颗粒的光学吸收逐渐减弱,当内核为空心时,吸收最强.利用等离激元杂化理论及自由电子和振荡电子变化的竞争机制对上述现象进行了理论分析.
Based on the Mie scattering theory, the change of the thickness of the gold shell, the change of the size of the core and the absorption spectrum of the gold nanosphere under the change of the medium were studied. It was found that with the increase of the thickness of the gold shell, the optical absorption of the particles decreased to the maximum value With the increase of the size of the core, the maximum optical absorption of the gold shell particles decreases gradually. In addition, the optical absorption of the particles gradually decreases with the increase of the dielectric constant of the core, and the absorption is the strongest when the core is hollow. The theory of plasmon resonance and the competitive mechanism of free electrons and oscillating electrons make theoretical analysis on the above phenomena.