摘要
提出用电路模型实验的方法对铁电液晶基相位编码系统进行材料参量设计.建立了编码系统中关于相位分析的铁电液晶电路模型.以铁电液晶材料的典型参数(自发极化强度、转动粘滞系数以及液晶薄膜厚度)为参变量,给出了稳态方位角(表征外加电场引起的铁电液晶折射率变化)与各参变量间的依赖关系,以及各参变量对调制速率的影响.实验结果表明:调制速率随自发极化强度的提高而增加,随转动粘滞系数、液晶薄膜厚度的提高而减慢.控制自发极化强度取值大于38nC/cm3,转动粘滞系数小于210mPa.s,液晶薄膜厚度小于24μm可使稳态方位角满足基于相位编码系统提出的参考值.
An improved circuit model of ferroelectric liquid crystal （ FLC ）, whose validity has been demonstrated in previous papers, is firstly incorporated with phase encryption system and then applied into the study of FLC material parameters design. Both transient and stable responses of FLC are given, in order to indicate the relationship between stable azimuth angle, which represent the variety of refractive index induced by electric field, and the typical parameters of FLC （ like spontaneous polarization, rotational viscosity and thickness of liquid crystal film）, and the effect of each parameter on response velocity. The simulation results show that the response velocity quickens as spontaneous polarization increases and rotational viscosity as well as thickness of liquid crystal film decreases. And the stable azimuth angle is arranged to the referenced value that proposed based on phase encryption system when spontaneous polarization is lager than 38nC/cm^2, rotational viscosity is lower than 210mPa · s, and the thickness of liquid crystal film is lower than 2. 4μm.
出处
《应用基础与工程科学学报》
EI
CSCD
2006年第4期590-596,共7页
Journal of Basic Science and Engineering
基金
国家自然科学基金(No.1017405790201011)
教育部科学技术研究重点项目(No.105148)
四川省应用基础研究项目(No.03JY029-048-1)
西南交通大学科学研究基金(No.2001B11)资助项目
关键词
铁电液晶
相位编码
电路模型
自发极化强度:转动粘滞系数
ferroelectric liquid crystal
phase encryption
circuit model
spontaneous polarization
rotational viscosity
