文献类型：期刊文献

中文题名：光定域化蓝相软晶格结构的光学应用

英文题名：Light-patterned blue phase soft cubic superstructure in optical applications

作者：袁丛龙[1];周康[1];王骁乾[1];沈冬[1];郑致刚[1]

机构：[1]华东理工大学理学院,上海200237

年份：2018

卷号：33

期号：7

起止页码：539

中文期刊名：液晶与显示

外文期刊名：Chinese Journal of Liquid Crystals and Displays

收录：CSTPCD;;Scopus;WOS:【ESCI(收录号:WOS:000442515200001)】；北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：Supported by National Natural Science Foundation of China (No. 61435008, No. 61575063); Shanghai Rising-Star Program (No. 17QA1401100)

语种：中文

中文关键词：蓝相液晶;光取向;定域化;超结构;衍射;刺激-响应

外文关键词：blue phase;photo-alignment;localization;superstructure;diffraction;stimuli-responsive

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532nm到610nm,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。
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,apreferable feature of the devices is photo-induced dynamicalerasability 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.