各向异性范德华纳米粒子中的Anapole态和散射偏转效应
Anapole states and scattering deflection effects in anisotropic van der Waals nanoparticles
摘要：
过渡金属二硫属化合物（TMDC）属于范德华材料，是一种很有前途的光电子和光子学材料。特别是，他们的巨大的光学各向异性，可以使重要的光学效果时，在纳米结构中采用有限的厚度。在本文中，我们从理论上和数值计算研究从各向异性的二硫化钼纳米圆柱体的光散射行为，并突出其独特的功能，优于传统的硅颗粒的响应相同的形状。我们建立了两个显着的现象，出现在相同的二硫化钼粒子与优化的几何形状。第一种是与电偶极回复态激发有关的纯磁偶极散射。以前只报道了核壳混合（金属/电介质）系统，现在在全电介质颗粒中证明了这一点。第二种现象是在远场的超偏转：最大散射可能发生在很宽的方向范围内，包括前向，后向和侧向散射取决于MoS 2纳米柱和入射波的相互取向。与众所周知的Kerker和anti-Kerker效应（出现在不同频率的纳米粒子中）相反，超偏转可以通过以恒定频率的入射光旋转粒子来实现。我们的研究结果促进了功能光学器件的发展，将纳米结构的各向异性TMDC，并可能鼓励进一步研究基于高度各向异性材料的超光学。
英文摘要：
Transition metal dichalcogenides (TMDCs), belonging to the class of van der Waals materials, are promising materials for optoelectronics and photonics. In particular, their giant optical anisotropy may enable important optical effects when employed in nanostructures with finite thickness. In this paper, we theoretically and numerically study light scattering behavior from anisotropic MoS2 nanocylinders, and highlight its distinct features advantageous over the response of conventional silicon particles of the same shape. We establish two remarkable phenomena, appearing in the same MoS2 particle with optimized geometry. The first one is a pure magnetic dipole scattering associated with the excitation of the electric-dipole anapole states. Previously reported in core-shell hybrid (metal/dielectric) systems only, it is now demonstrated in an all-dielectric particle. The second phenomenon is the super-deflection in the far field: the maximum scattering may occur over a wide range of directions, including forward-, backward- and side-scattering depending on the mutual orientation of the MoS2 nanocylinder and the incident wave. In contrast to the well-known Kerker and anti-Kerker effects, which appear in nanoparticles at different frequencies, the super-deflection can be achieved by rotating the particle at a constant frequency of incident light. Our results facilitate the development of functional optical devices incorporating nanostructured anisotropic TMDCs and may encourage further research in meta-optics based on highly anisotropic materials.
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