Opt Express. 2023 Apr 10;31(8):13428-13435. doi: 10.1364/OE.486201.
Photoalignment of liquid crystal polarization grating based on optical imprinting is a promising technique for polarization grating mass production. However, when the period of the optical imprinting grating is in the sub-micrometer level, the zero-order energy from the master grating will become high, and it will strongly affect the photoalignment quality. This paper proposes a double-twisted polarization grating structure to eliminate the zero-order disturbance of master grating and gives the design method. Based on the designed results, a master grating was prepared, and the optically imprinted photoalignment of polarization grating with a period of 0.5μm was fabricated. This method has the advantages of high efficiency and significantly greater environmental tolerance than the traditional polarization holographic photoalignment methods. It has the potential to be used for large-area polarization holographic gratings production.
基于光学压印的液晶偏振光栅的光取向技术是一种很有前途的偏振光栅大规模生产技术。然而，当光学压印光栅的周期达到亚微米级时，主光栅的零级能量将会变得很高，从而强烈影响光取向质量。本文提出了一种双扭曲偏振光栅结构来消除主光栅的零级干扰，并给出了设计方法。基于设计结果，制备了一个主光栅，并制作了周期为 0.5μm 的偏振光栅的光取向。与传统的偏振全息光取向方法相比，该方法具有高效率和更大的环境容忍度的优点。它有可能用于大面积偏振全息光栅的生产。
