Xiong Jianghao, Wu Shin-Tson
Opt Express. 2020 Nov 23;28(24):35960-35971. doi: 10.1364/OE.410271.
Several types of liquid crystal polarization gratings (LCPGs) can be achieved depending on their molecular configurations and diffraction properties. We perform detailed numerical studies of these LCPGs based on the rigorous coupled-wave analysis (RCWA) approach. The unique properties of Raman-Nath and Bragg gratings are investigated, and how the transition between them influences the diffraction behaviors is explained. Two types of LCPGs, corresponding to the planar and the slanted director configurations, are compared in detail. The influence of gradient-pitch on the performance of reflection grating is also explored. Potential applications of these LCPGs for near-eye displays are emphasized.
根据液晶偏振光栅（LCPG）的分子构型和衍射特性，可以实现几种不同类型的光栅。我们基于严格耦合波分析（RCWA）方法对这些LCPG进行了详细的数值研究。研究了拉曼 - 奈斯光栅和布拉格光栅的独特特性，并解释了它们之间的转变如何影响衍射行为。详细比较了对应于平面指向矢构型和倾斜指向矢构型的两种类型的LCPG。还探讨了渐变间距对反射光栅性能的影响。强调了这些LCPG在近眼显示方面的潜在应用。
