Lee Seojun, Kim Hyungchae, Lee Jongcheon, Kim Changsoon
Opt Express. 2017 Apr 17;25(8):9105-9115. doi: 10.1364/OE.25.009105.
We investigate scattering of surface plasmon polaritons (SPPs) at a planar metal-dielectric interface by a dielectric nanocube embedded in the metal layer using finite element method-based simulations. The scattering characteristics of the embedded nanocube, such as the scattering and absorption cross sections, far-field scattering patterns, reflectance, and transmittance, are calculated as functions of the wavelength of the incident SPP waves in the visible range. The main features of the characteristics are explained in connection with the excitation of plasmonic eigenmodes of the embedded nanocube. The most efficient scattering into waves propagating away from the metal surface, i.e., the radiating modes, occurs when a dipolar-like plasmonic mode is excited, whose eigenfrequency can be tuned by changing the edge length of the nanocube.
我们使用基于有限元方法的模拟研究了嵌入金属层中的介电纳米立方体在平面金属-介电界面处对表面等离激元极化激元（SPP）的散射。计算了嵌入纳米立方体的散射特性，如散射和吸收截面、远场散射图案、反射率和透射率，作为可见范围内入射SPP波波长的函数。结合嵌入纳米立方体的等离激元本征模的激发来解释这些特性的主要特征。当激发一种类似偶极子的等离激元模式时，会发生向远离金属表面传播的波（即辐射模式）的最有效散射，其本征频率可通过改变纳米立方体的边长来调谐。
