向列相液晶器件光调制性能研究  

Study on Optical Modulation Performance of Nematic Liquid Crystal Devices

作　　者：王萧 鲁小鑫 张雪凤 王浪 乌日娜[1] WANG Xiao;LU Xiaoxin;ZHANG Xuefeng;WANG Lang;WU Rina(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学理学院,沈阳110159

出　　处：《沈阳理工大学学报》2024年第1期91-96,共6页Journal of Shenyang Ligong University

基　　金：2022年辽宁省“揭榜挂帅”科技计划重点项目;沈阳理工大学光选科研团队建设项目;辽宁省博士科研启动基金计划项目(2021-BS-161)。

摘　　要：液晶的折射率易受外加电压和温度的影响,据此可获得电场和温度可调制器件。为改善液晶器件对光的调制性能,制备了向列相液晶器件,并对其调制性能进行理论模拟和实验研究。首先研究液晶器件的透过光强和相位延迟随电压变化关系,结果显示,相同电压下,增大器件厚度,光强调制曲线的峰谷数增多,相位调制量增大,其中电压在0.8~3 V范围内,相位延迟曲线变化较明显,厚度为4、6和10μm的器件可分别获得约1.21π、1.87π和3.19πrad的相位调制量。其次对厚度为4μm的器件进行温度可调制性能的研究,结果显示,温度从20℃升至45℃时,获得的温度可调制量约为0.29πrad。改变电场或温度均能引起液晶的折射率变化,从而实现对光的调控,适当增加液晶器件厚度可获得较大的相位调制量。研究结果对液晶光调制器件的性能改善及应用具有重要参考意义。The refractive index of liquid crystal is susceptible to the voltage and temperature,and the electric field and temperature modulable devices can be obtained.In order to improve the optical modulation performance of liquid crystal devices,nematic liquid crystal devices are fabricated,and their modulation performance is theoretically simulated and experimentally studied.Firstly,the relationship between the light intensity and phase delay of the liquid crystal device and the voltage is studied.Under the same voltage,increasing the thickness of the device,the number of peaks and valleys of the light intensity modulation curve increases,and the phase modulation amount increases.In the range of 0.8~3 V,the phase delay curve changes obviously.Devices with thickness of 4,6 and 10μm can get phase modulation of about 1.21π,1.87πand 3.19πrad,respectively.Secondly,the temperature modulation performance of 4μm device is studied.When the temperature increases from 20℃to 45℃,the temperature modulation amount is about 0.29πrad.Therefore,changing the electric field or temperature can cause the refractive index of the liquid crystal to change,so as to realize the regulation of light.A larger phase modulation can be obtained by appropriately increasing the thickness of the liquid crystal device.The research results are important reference for the performance improvement and application of liquid crystal optical modulators.

关 键 词：液晶光调制器 向列相液晶 光强调制 相位调制 

分 类 号：O753.2[理学—晶体学] TN761[电子电信—电路与系统]