Light-patterned blue phase soft cubic superstructure in optical applications

Cong-long YUAN; Kang ZHOU; Xiao-qian WANG; Dong SHEN; Zhi-gang ZHENG

doi:10.3788/YJYXS20183307.0539

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Light-patterned blue phase soft cubic superstructure in optical applications

Material and Device | 更新时间：2020-07-06

- Light-patterned blue phase soft cubic superstructure in optical applications
- Chinese Journal of Liquid Crystals and Displays Vol. 33, Issue 7, Pages: 539-547(2018)
- 作者机构：
  
  华东理工大学理学院, 上海 200237
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20183307.0539
  CLC： TN141.9
- Received：07 March 2018，
  
  Accepted：23 April 2018，
  
  Published：2018-07
- 稿件说明：
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Cong-long YUAN, Kang ZHOU, Xiao-qian WANG, et al. Light-patterned blue phase soft cubic superstructure in optical applications[J]. Chinese journal of liquid crystals and displays, 2018, 33(7): 539-547.
DOI：

Cong-long YUAN, Kang ZHOU, Xiao-qian WANG, et al. Light-patterned blue phase soft cubic superstructure in optical applications[J]. Chinese journal of liquid crystals and displays, 2018, 33(7): 539-547. DOI： 10.3788/YJYXS20183307.0539.

摘要

实验利用表面光取向技术控制蓝相晶格的有序生长，将光定域化取向与分子自组装相结合。通过对基板表面进行交替的取向/非取向控制，平面内获得周期排列的微结构，使蓝相图形化结构的反射光强度在空间上形成周期性调制，同时设计制备了振幅型衍射器件；通过对基板表面做正交取向方向交替排列的微结构，使蓝相图形化结构的反射光相位在空间上形成周期性调制，设计制备了相位型衍射器件。这两类衍射器件均具有对入射光的波段选择性，即只有当入射光的波长局域在蓝相的反射带时才会呈现衍射效应。蓝相液晶软物质的特性又赋予它在电场下可调谐的波段选择性，即反射带位置随电场的增加发生红移从532 nm到610 nm，电场撤除则回复到初始状态。同时，借助于光取向材料的光可擦写特性，蓝相晶格的取向微结构能够重复的擦写与重构，从而实现不同衍射器件乃至不同衍射调制方式的转换。

Abstract

Combining light-patterning process with self-assembly trait

we applied photo-alignment technique to control the arrangement of liquid crystal blue phase (BP) cubic superstructure. By means of generating alternate aligned areas and non-aligned areas

the amplitude-modulation diffraction devices can be designed

which derives from the periodic reflection intensity of the patterned BP. By means of generating alternate orthogonal alignment directions

the phase-modulation diffraction devices can be designed

which are owing to the periodic reflected phase from the patterned BP. These two types of diffraction devices exhibit peculiarly wavelength-selectivity

which means that light diffraction occurs selectively to certain wavelength. Based on the soft attribute of BP

these devices can respond to applied electric field leading to a tunable wavelength-selectivity. When the external electric field was applied

the corresponding reflection waveband of BP exhibited a continuous red-shifting from 532 nm to 610 nm. Furthermore

a preferable feature of the devices is photo-induced dynamical erasability and rewritability due to rewritable characteristic of the photoalignment film

which results in realizing the conversion of different diffractive devices and even diffractive modulation modes.

关键词

Keywords

references

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