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首页> 外文会议>Plasmonics: Metallic nanostructures and their optical properties VIII >Electrostatic plasmon resonances of metal nanoparticles instratified geometries
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Electrostatic plasmon resonances of metal nanoparticles instratified geometries

机译：层状几何形状中的金属纳米粒子的静电等离子体共振

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摘要

A theoretical electrostatic approach for determination of plasmon eigenresonances and absorption cross section spectra of arbitrarily shaped metal nanoparticles with cylindrical symmetry in stratified geometries is presented. The method is based on a surface integral equation for the surface polarization charge density. From symmetry considerations and by incorporating all effects of the stratified surrounding into the Green's function we show how the three dimensional analysis can be reduced to a single integral over the polar angle along the surface of the metal nanoparticle. The theoretical scheme is exemplified by analyzing silver nanoparticles shaped as spheres, oblate spheroids, and nanodisks in different surroundings involving silicon. The effect of varying the distance between a silver sphere and a silicon surface on plasmonic eigenvalues and absorption cross section spectra is presented. By flattening silver oblate spheroids and nanodisks embedded in a homogenous silicon surrounding it is shown how the fundamental horizontally polarized plasmon resonance can be shifted into the near infrared wavelength range. Also the effect of varying the thickness of thin silicon films with silver nanoparticles embedded is presented. The results indicate that silver nanoparticles embedded in silicon could be interesting for plasmon assisted solar cells.
机译：提出了确定层状几何形状中圆柱对称的任意形状的金属纳米粒子的等离激元本征共振和吸收截面谱的理论静电方法。该方法基于表面极化电荷密度的表面积分方程。从对称性的角度出发，并将分层周围环境的所有影响纳入格林函数，我们展示了三维分析如何可以沿金属纳米粒子的表面在整个极角上简化为单个积分。通过分析在涉及硅的不同环境中形状为球形，扁球形和纳米盘状的银纳米颗粒，可以举例说明该理论方案。提出了改变银球和硅表面之间的距离对等离子体特征值和吸收截面谱的影响。通过将扁长的扁球形的银球和嵌入在周围均匀硅中的纳米圆片弄平，可以显示出基本的水平极化等离子体激元共振如何转移到近红外波长范围内。还提出了改变嵌入了银纳米颗粒的硅薄膜厚度的影响。结果表明，嵌入在硅中的银纳米颗粒对于等离激元辅助太阳能电池可能是有趣的。

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