Sun Xiaojie, Xu Mingzhu, Wang Guangxue, Song Qiuyang, Li Yang, Gao Xiumin
Appl Opt. 2022 Apr 20;61(12):3435-3442. doi: 10.1364/AO.451392.
Based on the theory of circular polarization dichroism in electromagnetic fields, this paper studies the circular dichroism (CD) characteristics of metasurfaces. Using a stable silicon material, an innovative "double L-shaped" composite structure formed by two L crosses is proposed to improve CD. Under a wide spectrum with wavelengths of 1000-1500 nm, the left circularly polarized (LCP) and right circularly polarized (RCP) lights pass through the structure, and we study the influence of different structural parameters on the CD, in order to obtain the best structural parameters. These realize the cross polarization of left-right circularly polarized light. In addition, at the wavelength of 1302.63 nm, the LCP light illuminates the structure, which realizes the cross polarization of LCP light; that is, the structure realizes the function of a half-wave plate. The RCP light incident structure realizes the function of a filter. It has great application prospects in biological detection, half-wave plates, filters, and other fields.
基于电磁场中的圆偏振二向色性理论，本文研究了超表面的圆二色性（CD）特性。使用稳定的硅材料，提出了一种由两个L形交叉组成的创新型“双L形”复合结构来改善圆二色性。在波长为1000 - 1500 nm的宽光谱下，左旋圆偏振（LCP）光和右旋圆偏振（RCP）光穿过该结构，我们研究了不同结构参数对圆二色性的影响，以获得最佳结构参数。这些实现了左右圆偏振光的交叉偏振。此外，在波长为1302.63 nm时，左旋圆偏振光照亮该结构，实现了左旋圆偏振光的交叉偏振；即该结构实现了半波片的功能。右旋圆偏振光入射结构实现了滤波器的功能。它在生物检测、半波片、滤波器等领域具有广阔的应用前景。
