基于单步曝光的光配向液晶器件研究及应用  

Research and application:liquid crystal devices fabricated by single-exposure photoalignment

作　　者：刘澍鑫 庄仲森 李燕[1] 阎泽昆 苏翼凯[1] LIU Shu-xin;ZHUANG Zhong-sen;LI Yan;YAN Ze-kun;SU Yi-kai(Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《液晶与显示》2021年第6期761-771,共11页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61727808,No.62075127)。

摘　　要：本文提出了一种基于空间光调制器的可实现任意图案设计的单步曝光光配向方法。通过像素级精确控制输出光的偏振方向,可完成对局部区域液晶指向矢的自由取向,从而实现具有任意图案设计的Pancharatnam-Berry(PB)相液晶器件的制作。这种非干涉曝光投影光配向法不仅简单、高效,并且能大幅降低环境扰动的影响。基于该方法,采用两种光取向材料制备了多种PB相液晶器件光栅、透镜、全息图和q-plate等。实验表明,本文制作的PB相液晶器件可实现连续的相位分布和较高的衍射效率。基于这些PB相器件,本文进一步提出了应用于增强现实显示领域的抬头显示和头戴式显示系统。This paper proposed a single-exposure photoalignment method based on a spatial light modulator,which could realize arbitrary pattern design.The polarization direction of the output light can be controlled on the pixel level,and then different local liquid crystal(LC)orientations are generated.Hence,Pancharatnam-Berry(PB)phase LC devices with arbitrary LC distribution patterns,can be fabricated using our method.Such a non-interference single-exposure method is simple and efficient,and is less sensitive to the influence of environmental interference.Based on this approach,we fabricated a variety of PB phase LC devices:gratings,lenses,holograms and q-plates using two photoalignment materials.Our PB phase LC devices can achieve high diffraction efficiency with continuous phase distribution.Based on the PB devices we also designed a head-up display and a head-mounted display system for augmented reality applications.

关 键 词：液晶器件 光配向 空间光调制器 几何相位 PB相 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] O753+.2[自动化与计算机技术—计算机科学与技术]