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Surface plasmon near-field resonance characteristics of silver shell nanocylinders arranged in triangular geometry

机译：排列成三角形几何形状的银壳纳米圆柱的表面等离子体激元近场共振特性

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摘要

The optical near-field surface plasmon effects of a triangular system of silver nanoshell cylinders are numerically studied using the two-dimensional finite difference time domain method. The dependence of interparticle distance, shell thickness of the cylinder, dielectric constant of shell core as well as embedding medium, and orientation of the optical source plane on the plasmonic resonances of the nanocylinder shells is studied. The plasmonic resonances are found to have strong dependence on the interparticle distance. As the size of the particle is increased, the field intensity peak shows a redshift. The resonance condition varies with the dielectric constant of the environment as well as the core. In addition, the orientation of the incident source plane has a significant role in the near-field intensity distribution. Since the near-field intensity has the same trend as that of the scattering cross section, the results can be used in the design of various applications like sensing, antennas, and waveguides.
机译：使用二维有限差分时域方法，对银纳米壳圆柱体三角形系统的光学近场表面等离子体激元效应进行了数值研究。研究了粒子间距离，圆柱壳厚度，壳核以及包埋介质的介电常数以及光源平面的取向与纳米圆柱壳的等离子体共振的关系。发现等离子共振强烈依赖于颗粒间距离。随着粒子尺寸的增加，场强峰显示出红移。谐振条件随环境以及核心的介电常数而变化。此外，入射源平面的方向在近场强度分布中起着重要作用。由于近场强度的趋势与散射截面的趋势相同，因此该结果可用于各种应用的设计中，例如传感，天线和波导。

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