Liquid crystal spiral Dammann zone plates based on photoalignment technology

LIU Si-jia; ZHANG Yi-heng; ZHU Lin; CHEN Peng; LU Yan-qing

doi:10.37188/CJLCD.2022-0178

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Liquid crystal spiral Dammann zone plates based on photoalignment technology

Liquid Crystal Optics | 更新时间：2023-03-15

- Liquid crystal spiral Dammann zone plates based on photoalignment technology
- Chinese Journal of Liquid Crystals and Displays Vol. 38, Issue 1, Pages: 1-9(2023)
- 作者机构：
  
  1.南京大学现代工程与应用科学学院，江苏南京 210023
- 作者简介：
- 基金信息：
  
  the National Key R&D Program of China(2021YFA1202000);National Natural Science Foundation of China （NSFC）(62222507;12004175;62175101);Natural Science Foundation of Jiangsu Province(BK20212004;BK20200311)
- DOI：10.37188/CJLCD.2022-0178
  CLC：
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LIU Si-jia, ZHANG Yi-heng, ZHU Lin, et al. Liquid crystal spiral Dammann zone plates based on photoalignment technology. [J]. Chinese Journal of Liquid Crystals and Displays 38(1):1-9(2023)
DOI：

LIU Si-jia, ZHANG Yi-heng, ZHU Lin, et al. Liquid crystal spiral Dammann zone plates based on photoalignment technology. [J]. Chinese Journal of Liquid Crystals and Displays 38(1):1-9(2023) DOI： 10.37188/CJLCD.2022-0178.

摘要

涡旋光阵列在光通信、多微粒操控、并行激光加工等领域有着广阔的应用前景，近年来受到越来越多的关注。然而动态可调的纵向涡旋光阵列的实现仍具有一定挑战性。本文基于达曼编码方法与液晶光取向技术，设计并制备出一种液晶螺旋达曼波带片。实验结果表明，该器件可以高效地产生拓扑荷数逐级变化的1×5纵向涡旋光阵列，并可以通过改变外加电压来动态切换器件的开关态。此外，该器件通过水平/竖直翻转一次或是改变入射光模式，还可以对产生的纵向涡旋光阵列的拓扑荷数进行反转变换或加减运算。液晶螺旋达曼波带片兼具低成本、高效率、电光可调等优势，有望促进液晶光电元件在多维光场调控等领域的应用。

Abstract

In recent years， optical vortex arrays have attracted increasing attention for their potential applications in numerous areas， such as optical communications， multiple-particle manipulation and parallel laser fabrication. However， the generation of switchable longitudinal vortex arrays remains a great challenge. In this paper， a liquid crystal （LC） spiral Dammann zone plate is designed via the Dammann encoding method and fabricated via the LC photoalignment technology. The experimental results show that this device can create a 1×5 longitudinal vortex array with high efficiency， and with space-variant topological charges. Through tuning the applied voltage， the device can be switched between ON and OFF state dynamically. Besides， the topological charges of the generated longitudinal vortex array can undergo a reversal or additive transformation by horizontally/vertically flipping the device or altering the mode of incident light. The LC spiral Dammann zone plate is distinguished by low cost， high efficiency and electro-optical tunability， thus facilitating the applications of LC elements in the field of multi-dimensional beam shaping.

关键词

液晶光取向技术涡旋光阵列达曼光栅

Keywords

liquid crystalphotoalignment technologyoptical vortex arrayDammann grating

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