一种高性能液晶透镜的设计方法  

Design Method for High-Performance Liquid Crystal Lens

作　　者：冯文斌 刘志强 徐律涵 李慧海 叶茂 Feng Wenbin;Liu Zhiqiang;Xu Lühan;Li Huihai;Ye Mao(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China;Sichuan Tianwei Electronic Co.,Ltd.,Chengdu 610200,Sichuan,China)

机构地区：[1]电子科技大学光电科学与工程学院,四川成都611731 [2]四川天微电子股份有限公司,四川成都610200

出　　处：《光学学报》2023年第2期184-191,共8页Acta Optica Sinica

基　　金：四川省科技计划(2021YJ0102)。

摘　　要：提出了一种高性能液晶透镜的设计方法。该方法结合了电极结构的设计并利用了液晶材料线性响应区。所设计的电极结构用于产生抛物线的电压分布,将驱动电压控制在液晶材料的线性响应区内可以实现抛物线的相位分布。通过该方法设计的液晶透镜,其孔径可以是任意大小,且不依赖高阻膜。所设计的电极结构简单,加工只需要一次光刻。透镜由两个低电压驱动,驱动方法简单,其焦距可通过两个驱动电压进行调节。理论上这种液晶透镜的相位分布在变焦过程中保持理想的抛物线分布,且光焦度正比于两个驱动电压的差值。实验上,通过光刻法加工了所设计的电极结构,测量了液晶材料的线性响应区,制作了液晶层厚度为50μm的液晶透镜。通过偏振干涉原理采集了干涉条纹,并从中提取了相位信息。实验结果表明,透镜的相位服从抛物线分布,且光焦度与驱动电压的差值成正比。实验结果与理论分析一致。Objective The electrode patterns of liquid crystal lenses are used to generate an inhomogeneous electric field by controlling the rotation of the liquid crystal molecules,thus producing a lenslike phase distribution.In the last few decades of development of liquid crystal lens,many different structures have been proposed,such as holepatterned electrodes,concentric electrodes,modal lenses,and some other variations of these structures.With the development of liquid crystal lenses,the performance has been significantly improved,and many associated problems,such as small aperture,high driving voltage,slow response,and disclination line,have been solved.Despite of this,the traditional liquid crystal lenses still face some problems that hinder the practical application of liquid crystal lenses.For traditional liquid crystal lenses,the voltage distribution formed by electrode is affected by many parameters,such as the voltage frequency,voltage phase,size of aperture,and thickness of liquid crystal layer.Therefore,it is difficult to obtain a parabolic voltage profile of an ideal liquid crystal lens for the traditional liquid crystal lenses,which increases the aberrations.To improve the performance of a liquid crystal lens,an electrode design that generates a parabolic voltage profile is desired.On the other hand,traditional liquid crystal lenses need highresistance layers to enlarge aperture size.However,the properties of highresistance layers usually change over time,resulting in changes in the properties of the liquid crystal lenses.The faced problems by traditional liquid crystal lenses have become an obstacle to the mass production of liquid crystal lenses.The primary objective of this study is to design a highperformance liquid crystal lens with ideal phase profile,which also overcomes the associated drawbacks of traditional liquid crystal lenses mentioned above.Methods The proposed liquid crystal lens combines the electrode structure design and the linear response range of liquid crystal materials to improve the pe

关 键 词：光学器件 液晶器件 透镜 相位 

分 类 号：O435.1[机械工程—光学工程]