论文标题
在涂层底物上介电纳米颗粒的MIE共振的极化控制的激发
Polarization-controlled selective excitation of Mie resonances of dielectric nanoparticle on a coated substrate
论文作者
论文摘要
具有低材料损失的高索引球形纳米颗粒支持尖锐的高Q电和磁共振，并表现出许多有趣的光学现象。制造技术的发展使得能够进一步研究其性质和研究相关的光学效应。沉积在基板上后，由于相互相互作用，粒子的光学特性发生了巨大变化。在这里，我们考虑在介电单层底物上的硅球形纳米颗粒。在光的正常发生率下，层厚度控制纳米颗粒电和磁多物对随后的光学响应的贡献。我们表明，以特定的激发角度和层厚度更改入射光的极化会导致在多物之间切换。我们进一步观察到相关的极化驱动的控制对散射辐射的方向。
High-index spherical nanoparticles with low material losses support sharp high-Q electric and magnetic resonances and exhibit a number of interesting optical phenomena. Developments in fabrication techniques have enabled the further study of their properties and the investigation of related optical effects. After deposition on a substrate, the optical properties of a particle change dramatically due to mutual interaction. Here, we consider a silicon spherical nanoparticle on a dielectric one-layered substrate. At the normal incidence of light, the layer thickness controls the contribution of the nanoparticle's electric and magnetic multipoles to the subsequent optical response. We show that changing the polarization of incident light at a specific excitation angle and layer thickness leads to switching between the multipoles. We further observe a related polarization-driven control over the direction of the scattered radiation.
