Luo Shiqi, Peng Kangzhun, Li Zhi-Yuan, Liang Wenyao
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2025 Jan 25;15(3):189. doi: 10.3390/nano15030189.
Vortex dichroism in chiral metamaterials is of great significance to the study of photoelectric detection, optical communication, and the interaction between light and matter. Here we propose a compact chiral metamaterials structure composed of two elliptical SiO rods covered with a Au film on a substrate to achieve a significant vortex-dichroism effect. Such a structure has different responses to a Laguerre-Gaussian beam carrying opposite-orbital angular momentum, resulting in giant vortex dichroism. The influences of various structural parameters are analyzed, and the optimal parameters are obtained to realize a remarkable vortex dichroism of about 58.5%. The simplicity and giant VD effect of the proposed metamaterials make it a promising candidate for advancing chiral optical applications such as optical communication and sensing.
手性超材料中的涡旋二向色性对于光电探测、光通信以及光与物质相互作用的研究具有重要意义。在此，我们提出一种紧凑的手性超材料结构，它由两根覆盖有金膜的椭圆形SiO棒组成，置于衬底上，以实现显著的涡旋二向色性效应。这种结构对携带相反轨道角动量的拉盖尔 - 高斯光束具有不同响应，从而产生巨大的涡旋二向色性。分析了各种结构参数的影响，并获得了最优参数，以实现约58.5%的显著涡旋二向色性。所提出的超材料结构的简单性和巨大的VD效应使其成为推进诸如光通信和传感等手性光学应用的有前途的候选者。
