文献类型：期刊文献

中文题名：基于胆甾相液晶倾斜螺旋的宽光谱动态域光电调制

英文题名：Photoelectronic modulation of broad spectral dynamic range based on heliconical cholesteric liquid crystals

作者：贾淑珍[1];袁丛龙[2];刘炳辉[2];胡宏龙[3];沈冬[1];郑致刚[1,2]

机构：[1]华东理工大学物理系,上海200237;[2]华东理工大学材料科学与工程学院,上海200237;[3]华东理工大学化学与分子工程学院,上海200237

年份：2021

卷号：36

期号：8

起止页码：1061

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:000684292800001)】；北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：Supported by National Natural Science Foundation of China (No.61822504,No.62035008,No.51873060); Shanghai Rising Star Program (No.17QA1401100);Fundamental Research Funds for the Central Universities

语种：中文

中文关键词：胆甾相液晶;倾斜螺旋;光电调制;宽谱域调制

外文关键词：cholesteric liquid crystal;heliconical structure;photoelectric modulation;broad spectral range modulation

摘要：本文通过在倾斜螺旋胆甾相液晶中引入光敏手性分子,设计了一种光响应倾斜螺旋胆甾相液晶体系。在电场和光场的协同作用下,螺旋结构的选择性反射可以实现从可见光到近红外区域宽光谱动态域调控。倾斜螺旋结构的反射光谱调谐范围与体系初始螺旋扭曲力相关,通过调节手性材料的浓度,倾斜螺旋胆甾相液晶在电场作用下实现了从可见光到近红外区域约580 nm较宽光谱范围的反射带调节。同时,在固定电场下,通过调节非偏振紫外光场的功率获得了覆盖整个可见光区域以及近红外区域约530 nm的光谱调控,其中光调控特性主要取决于光场产生的热效应以及偶氮基团的光致异构效应。此外,由于倾斜螺旋结构的电场依赖性,通过调制电场的强度可以控制倾斜螺旋胆甾相液晶反射带光场调制区间。
By introducing photosensitive chiral molecules into the heliconical cholesteric liquid crystal,a photoresponsive heliconical cholesteric liquid crystal system is designed.Under the synergistic effect of electric field and optical field,the selective reflection of the heliconical structure can be adjusted from visible light to near-infrared region.The tuning range of the reflection spectrum of the heliconical structure is related to the initial helical twisting power of the system.The heliconical cholesteric liquid crystal realizes a broad spectral range(about 580 nm)from visible light to near-infrared region under the modulation of electric field through adjusting the concentration of the chiral photosensitive molecule.Meanwhile,by modulating the power of the non-polarized ultraviolet light field,the tuning range(about 530 nm)of the heliconical cholesteric liquid crystal covering the entire visible light region and the near-infrared region is obtained under a fixed electric field.Such broad spectrum modulated by optical field mainly depends on the thermal effect of optical field and photoisomerization effect of azobenzene.In addition,due to the electric field dependence of the heliconical structure,the optical field modulation interval of the heliconical cholesteric liquid crystal reflection band can be controlled by electric field.