核壳谐振球的广义散射特性
General Scattering Characteristics of Resonant Core-Shell Spheres
摘要：
本文介绍并讨论了小核壳等离子体球的电磁散射的一般特点和方面。首先，厚度对等离子体共振的影响是在静电（瑞利）限制，利用麦克劳林展开的米氏系数的空心散射体。给出了有关芯效应的几个方面，说明了其静电极限下共振散射响应的致能机理和特点。通过新引入的Padé展开的米氏系数的散射过程中的电动力学方面的揭示。此外，我们揭示了核心材料如何影响的动态机制，如动态去极化和辐射阻尼。所描述的方法可以扩展到其他类型的共振和正则形状，而这里提出的一般特性，预计将刺激进一步的研究有关的核壳散射体的功能。
英文摘要：
This article presents and discusses the general features and aspects regarding the electromagnetic scattering by a small core-shell plasmonic sphere. First, the thickness effects on the plasmonic resonances are presented in the electrostatic (Rayleigh) limit, utilizing the MacLaurin expansion of the Mie coefficients of hollow scatterers. Several aspects regarding the core effects are given, illustrating the enabling mechanisms and peculiarities of its resonant scattering response on it electrostatic limit. The electrodynamic aspects of the scattering process are revealed through the newly introduced Padé expansion of the Mie coefficients. Additionally we expose how the core material affects the dynamic mechanisms, such as the dynamic depolarization and radiative damping. The described method can be expanded for other type of resonances and canonical shapes, while the general characteristics presented here are expected to stimulate further studies regarding the functionalities of the core-shell scatterers.
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