Abstract

The problem of excitation of a core–shell particle located on a transparent substrate by a field of an evanescent electromagnetic wave is considered. The particle consists of a dielectric core with a metal nanoplasmonic shell in which spatial dispersion occurs. Based on the Discrete Sources Method, a model has been constructed that considers the influence of the presence of the substrate and nonlocality in a metal on the optical scattering characteristics. The effect of the asymmetry of the particle geometry on the optical characteristics of the near field has been investigated. It was found that the asymmetry of the particle geometry significantly affects the intensity enhancement coefficient, as well as the absorption cross-section.

中文翻译：

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核-壳粒子几何形状的不对称性对基底的影响，解释了空间色散的光学特性

摘要

考虑了van逝电磁波对位于透明基板上的核-壳粒子的激发问题。该粒子由具有金属纳米等离子体壳的电介质核组成，其中发生了空间分散。基于离散源方法，构建了一个模型，该模型考虑了基材的存在和金属中的非局部性对光散射特性的影响。研究了粒子几何形状的不对称性对近场光学特性的影响。发现颗粒几何形状的不对称性显着影响强度增强系数以及吸收截面。