论文标题
多层扇形的等离子共振
Plasmon resonances in multilayer Fanoshells
论文作者
论文摘要
我们基于多极，准静态方法开发一个理论框架，以预测通过由金属核心组成的几何对称性纳米壳形成的fanoshells中的局部表面等离子体共振，该框架由金属核心组成，由金属核心组成，介电内壳和金属外壳。通过调整金 - 硅质多层纳米壳的核心和外壳偏移，我们表明理论模型与电动力学模拟非常吻合。当核心和外壳同时偏移时，偶极共振会更加抑制，而当核心，内壳或外壳被抵消时，偶极共振较少。我们将前者归因于双重对称性的耦合常数，而后者则将其归因于单个对称性的耦合常数。使用三个性能参数，我们将外壳偏移量作为用于传感应用的最佳fanoshell。这项研究系统地研究了雷利政权内的所有类型的基于偏移的，对称性破裂的金属 - 金属金属多层纳米壳。
We develop a theoretical framework, based on a multipole, quasi-static approach, for the prediction of the localized surface plasmon resonances in Fanoshells formed via geometrical symmetry-breaking in multilayer nanoshells consisting of a metallic core, a dielectric inner shell, and a metallic outer shell. By tuning the core and shell offsets of a gold-silica-gold multilayer nanoshell, we show that the theoretical model is in good agreement with electrodynamic simulations. The dipolar resonances are more suppressed when the core and the outer shell are concurrently offset, and less suppressed when either the core, the inner shell, or the outer shell is offset. We attribute the former to coupling constants arising from dual symmetry-breaking, and the latter to coupling constants due to single symmetry-breaking. Using three performance parameters, we propose the outer shell offset as the optimal Fanoshell for sensing applications. This study systematically investigates all types of offset-based, symmetry-broken, metal-dielectric-metal multilayer nanoshells within the Rayleigh regime.
