摘要
液晶光学相阵列是一种新型的光学相位调制器件,为分析器件中相移单元的电压-相移特性,建立了液晶相移单元的数学模型,并提出了一种混合差分迭代算法。该算法根据液晶分子在电场作用下的物理变化过程,在指向矢与电位的耦合迭代过程中,采用追赶法计算相移单元中的电位分布。根据该算法对相移单元中液晶指向矢的分布进行了仿真计算,进而对取向膜厚度、预倾角和液晶盒厚度对器件的电压-相移特性的影响进行了分析。结果表明,当电压处于阈值电压与饱和电压之间时,取向膜厚度对液晶的电压-相移特性的影响比较明显。
Liquid crystal optical phased array （LCOPA） is a novel optical phase modulator. To analyse the voltage-phase shift characteristic of the phase shift unit for LCOPA, a mathematical model of liquid crystal phase shift unit is set up, and a hybrid iterative finite-difference algorithm is proposed as well to calculate the director profde of the liquid crystal in a phase shift unit. According to the physical response process of liquid crystal molecules under electric field, the electric potential distribution in liquid crystal cell is calculated by means of Double-Sweep Method in the coupled iterative procedure of director and electric potential in this algorithm. Based on the algorithm, the influence of alignment layer thickness, pre-tilted angles and cell thickness on the voltage-phase shift characteristic of the device is discussed. Simulation results show that the influence of alignment layer thickness on the voltage-phase shift characteristic is evident on condition that the voltage is between threshold voltage and saturation voltage.
出处
《红外与激光工程》
EI
CSCD
北大核心
2007年第6期932-935,共4页
Infrared and Laser Engineering
基金
国防基础科研项目
关键词
液晶光学相阵列
指向矢
相移
取向膜
追赶法
Liquid crystal optical phased array
Director
Phase shift
Alignment f＇tim
Double-Sweep Method
