Flexible free-standing cholesteric liquid crystal films for multi-color reflectors

YAN Jing; FAN Xiang-wen; QU Ke; YU Ying; LI Ruo-zhou

doi:10.37188/CJLCD.2023-0218

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Flexible free-standing cholesteric liquid crystal films for multi-color reflectors

Device Physics and Device Preparation | 更新时间：2023-10-10

- Flexible free-standing cholesteric liquid crystal films for multi-color reflectors
- Chinese Journal of Liquid Crystals and Displays Vol. 38, Issue 10, Pages: 1330-1337(2023)
- 作者机构：
  
  1.南京邮电大学电子与光学工程学院，江苏南京 210023
  2.南京邮电大学集成电路科学与工程学院，江苏南京 210023
  3.南京邮电大学射频集成与微组装技术国家地方联合工程实验室，江苏南京 210023
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China(11904177;61704090);National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology(KFJJ20210205)
- DOI：10.37188/CJLCD.2023-0218
  CLC：
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YAN Jing, FAN Xiang-wen, QU Ke, et al. Flexible free-standing cholesteric liquid crystal films for multi-color reflectors. [J]. Chinese Journal of Liquid Crystals and Displays 38(10):1330-1337(2023)
DOI：

YAN Jing, FAN Xiang-wen, QU Ke, et al. Flexible free-standing cholesteric liquid crystal films for multi-color reflectors. [J]. Chinese Journal of Liquid Crystals and Displays 38(10):1330-1337(2023) DOI： 10.37188/CJLCD.2023-0218.

摘要

一维手性软光子晶体胆甾相液晶（CLC）在防伪标签、纳米激光器和传感等领域具有广泛的应用。本文采用多步图案化紫外固化方法并结合清洗-重填工艺，实现了多色的柔性自支撑CLC薄膜反射器件。采用标签打印机打印PET图案作为掩膜版，对可聚合的CLC材料进行紫外固化，得到图案化的柔性自支撑CLC薄膜反射器件。在此基础上，将非固化区域的液晶材料洗去并重新填充不同手性剂含量的CLC，再次图案化紫外曝光，即可实现多色的柔性自支撑CLC薄膜反射器件。研究了不同入射角、弯曲曲率半径和温度对反射器件光学性能的影响。实验结果表明，采用上述方法制备的多色可自支撑反射器件具有良好的柔性，不同曲率半径下的布拉格反射中心波长基本不变。随着温度升高，布拉格反射中心波长红移，且具有良好的线性度。多色的可自支撑柔性薄膜反射器件可拓展CLC在显示、传感、激光防护和微纳光学等领域的进一步应用。

Abstract

Cholesteric liquid crystals （CLCs）， one-dimensional chiral soft photonic crystals， have a wide application in fields such as security tags， nanolasers， and sensing. In this paper， a multi-step UV patterning curing method combined with a washout-refill process was used to realize multi-color free-standing flexible CLC film reflectors. A label printer is used to print PET patterned mask， and a polymerizable CLC material is UV cured to obtain the free-standing flexible patterned CLC film reflector. Based on this， the uncured material was washed-out， refilled with CLC of different chiral dopant content， and the patterned UV light was re-exposed to realize a multi-color flexible free-standing CLC reflector. The effects of different incidence angles， bending radius of curvature and temperature on the optical properties of the reflector are investigated. The experimental results show that the multi-color free-standing reflectors prepared by the above method have good flexibility， the Bragg reflection center wavelength is basically constant at different radii of curvature， and it is red-shifted with the increasing temperature， which has good linearity. This proposed multi-color free-standing flexible film reflector protocol can further expand CLC’s applications in the fields of display， sensing， laser protection and micro-nano optics.

关键词

胆甾相液晶布拉格反射多色自支撑柔性薄膜光学器件

Keywords

cholesteric liquid crystalbragg reflectionfree standing flexible filmoptical devices

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