论文标题
手性金属纳米颗粒中电磁偶极力矩的相互作用引起的轨道角动量二色性
Orbital angular momentum dichroism caused by the interaction of electric-magnetic dipole moments in chiral metal nanoparticles
论文作者
论文摘要
通过手性物体对循环极化光的反应引起的圆二色性（CD）已经很好地确定，等离子元元分子的强烈CD近年来也引起了人们的关注。但是，如果光也具有轨道角动量，它们的反应尚不清楚。在本文中，在数值研究的光束照明下，具有轨道和旋转角动量的光束照明下，等离激元的前纤维性手性结构的二分法是数值研究的。在不同的动量下观察到了杰出的光谱。涡流束和光自旋的组合下的圆形二色性增强了。这种现象归因于纳米颗粒的部分空间激发，并且由于涡旋束的部分激发引起的诱导电气和磁模式以及其他高阶模式的相互作用，强烈的二分色素是同时引起的。这项研究提供了对手性光 - 物质相互作用的进一步见解，以及光角与轨道角动量的二色性。
Circular dichroism (CD) caused by the response of a chiral object to circularly polarized light has been well established, and the strong CD of plasmonic meta-molecules has also become of interest in recent years; however, their response if the light also has orbital angular momentum is unclear. In this paper, the dichroism of a plasmonic cuboid-protuberance chiral structure under the illumination of a light beam with both orbital and spin angular momentums is numerically investigated. Distinguished spectra are observed under the different momentums. The circular dichroism under the combination of vortex beam and light spin is enhanced. This phenomenon is attributed to the partial spatial excitation of the nanoparticle, and the strong dichroism is simultaneously caused because of the interaction of the induced electric and magnetic modes and other higher-order modes caused by the partial excitation of the vortex beam. This research provides further insight into chiral light-matter interactions and the dichroism of light with orbital angular momentum.
