Fast and large-angle optical beam deflection based on liquid crystal polarization grating

YUAN Fang; TAN Qing-gui; WANG Guang-yao; YUAN Rui; HU Wei

doi:10.37188/CJLCD.2022-0240

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Fast and large-angle optical beam deflection based on liquid crystal polarization grating

Device Physics and Device Preparation | 更新时间：2022-10-28

- Fast and large-angle optical beam deflection based on liquid crystal polarization grating
- Chinese Journal of Liquid Crystals and Displays Vol. 37, Issue 11, Pages: 1411-1419(2022)
- 作者机构：
  
  1.西安空间无线电技术研究所，陕西西安 710100
  2.空间微波技术国家级重点实验室，陕西西安 710100
  3.南京大学现代工程与应用科学学院，江苏南京 210093
- 作者简介：
- 基金信息：
  
  National Key Laboratory Foundation(6142411195411)
- DOI：10.37188/CJLCD.2022-0240
  CLC：
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YUAN Fang, TAN Qing-gui, WANG Guang-yao, et al. Fast and large-angle optical beam deflection based on liquid crystal polarization grating. [J]. Chinese Journal of Liquid Crystals and Displays 37(11):1411-1419(2022)
DOI：

YUAN Fang, TAN Qing-gui, WANG Guang-yao, et al. Fast and large-angle optical beam deflection based on liquid crystal polarization grating. [J]. Chinese Journal of Liquid Crystals and Displays 37(11):1411-1419(2022) DOI： 10.37188/CJLCD.2022-0240.

摘要

基于液晶偏振光栅的快速大角度光束偏转技术在航空航天、激光通信、车载雷达、光信息处理、生物医药和军事对抗等领域具有重要应用前景，并得到了极大的关注。液晶聚合物偏振光栅可以实现高效率、大角度的光束偏转，并且制备工艺简单、成本低，逐渐被应用到非机械式光束偏转系统中。本文采用两种偏振全息光路分别实现大周期和小周期的液晶聚合物偏振光栅的制备，获得的液晶聚合物偏振光栅最高衍射效率达到99.3%。级联两个液晶聚合物偏振光栅，再层叠液晶聚合物\铁电液晶\液晶聚合物波片组，实现了更大角度范围的偏转，验证了70 μs的4通道光束快速扫描。

Abstract

Beam steering is widely used in aerospace， laser communication， vehicle-mounted ridar， optical information processing， biomedicine and military confrontation. Non-mechanical beam steering has received intensive attention. Liquid-crystal-polymer-based polarization grating can realize high-efficient， large-angle beam steering with merits of simple and low-cost fabrication， and thus has been gradually adopted in non-mechanical beam steering. In this paper， two circularly polarized holographic optical paths are used to fabricate the liquid-crystal-polymer-based polarization grating of different pitches， respectively. The measured diffraction efficiency reaches over 99.3%. Multiple liquid-crystal-polymer-based gratings are cascaded and then stacked with liquid crystal polymer/ferroelectric liquid crystal/liquid crystal polymer waveplates to achieve fast response （70 μs） and large angle 4-channel beam deflections.

关键词

偏振光栅光束扫描液晶聚合物铁电液晶

Keywords

polarization gratingbeam steeringliquid crystal polymerferroelectric liquid crystal

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