基于液晶动态响应的挠曲电系数测量  

Measurement of Flexoelectric Coefficient Based on the Dynamic Response of Liquid Crystal

作　　者：邢红玉[1,2,3] 叶文江[3] 蔡明雷[4] 刘晓梦[3] 张志东[3] 宣丽[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,吉林长春130033 [2]中国科学院大学,北京100049 [3]河北工业大学理学院,天津300401 [4]河北冀雅电子有限公司,河北石家庄050071

出　　处：《光学学报》2015年第3期324-328,共5页Acta Optica Sinica

基　　金：国家自然科学基金(11274088,11374087,11304074,11447179);河北省自然科学基金(A2014202123);河北省教育厅项目(QN2014130);河北省高校重点学科项目

摘　　要：基于自组装的液晶动态响应实验装置,研究了液晶挠曲电效应对强锚泊混合排列向列相(HAN)液晶动态响应过程的影响。实验中HAN液晶盒施加脉宽为250 ms、幅度可调的正负单脉冲电压信号,结果发现:幅度相同的正负脉冲电压信号作用下液晶的动态响应不同,幅度不同的正脉冲或负脉冲电压信号作用下液晶的动态响应也不同。通过幅度不同的正脉冲电压信号(3、4、5、6 V)作用下液晶动态响应实验曲线与考虑挠曲电效应情形下液晶动态响应理论曲线之间的比较,得到了液晶材料E7的挠曲电系数为e11+e33=4.0×10-11C/m,与文献中报道的实验测量值基本一致。Based on the self-assembly experimental installation, the influence of flexoelectric effect on the dynamic response of strong anchoring hybrid aligned nematic（HAN） liquid crystal is studied. The positive and negative monopulse with pulse width of 250 ms and adjustable amplitude are applied to HAN cell during experiment. The results show that the dynamic response of liquid crystal is different from the pulse with the same amplitude, as well as from the positive pulse or negative pulse with different amplitudes. Through comparing the experimental curves of the dynamic response of liquid crystal for different positive pulses 3 V, 4 V, 5 V, 6 V with the corresponding theoretical curves with the flexoelectric effect considered, the sum of flexoelectric coefficient of liquid crystal material E7 is e11＋e33=4.0×10-11C/m, which is in agreement with the experimental measurement value reported in the literature.

关 键 词：测量 混合排列向列相 动态响应 挠曲电效应 单脉冲 脉宽 

分 类 号：O753.2[理学—晶体学]