Metal nanoparticles have attracted intense attention due to their unique optical and thermal properties for applications such as micro-nano electronics and photonics. Relative orientation, interparticle spacing, and particle size strongly impact the optical behavior of the nanoparticle assemblies. The near-field confinement of electromagnetic fields between closely packed metal nanoparticles, which is enhanced due to their plasmonic behavior, creates high thermal energy densities under visible to near-infrared wavelength laser irradiation. As metal nanoparticles tend to be oxidized or change shape under laser illumination, resulting in non-linear optical and thermal behavior, surrounding each metal nanoparticle with a dielectric shell could be a potential way to mitigate these effects as well as to engineer their plasmonic behavior. In this study, we use numerical simulations to analyze the plasmonic behavior of gold (Au) nanoparticles surrounded with dielectric shell by investigating nanoparticle's various configurations to each other as well as their relative orientation to incoming light source under laser irradiation in dielectric media. Such geometries are of particular interest for applications such as photonic integrated circuits, photonic sintering and nanophotonic cooling.

金属纳米颗粒由于其独特的光学和热性能而吸引了广泛的关注，例如微纳米电子学和光子学。相对取向，颗粒间间距和颗粒尺寸强烈影响纳米颗粒组件的光学性能。紧密堆积的金属纳米粒子之间的电磁场的近场限制（由于其等离子体行为而增强）在可见光到近红外波长的激光辐照下产生高的热能密度。由于金属纳米粒子在激光照射下易于氧化或改变形状，从而导致非线性光学和热行为，因此，用介电壳包围每个金属纳米粒子可能是减轻这些影响并设计其等离子体行为的潜在方法。在这个研究中，我们使用数值模拟方法，通过研究纳米粒子彼此之间的各种构型及其在介电介质中激光照射下与入射光源的相对取向，来分析被电介质壳包围的金（Au）纳米粒子的等离子体行为。对于诸如光子集成电路，光子烧结和纳米光子冷却的应用，这种几何形状特别感兴趣。