对称折射率分布的液晶菲涅耳透镜的仿真研究  

Simulation of liquid crystal Fresnel lens with symmetrical refractive index distribution

作　　者：张广翔 于涛 刘永辉 梁缓缓 ZHANG Guangxiang;YU Tao;LIU Yonghui;LIANG Huanhuan(School of Science,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学理学院,辽宁大连116026

出　　处：《液晶与显示》2024年第6期735-742,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.12004063)。

摘　　要：本文设计了直径为16 mm的大孔径液晶菲涅耳透镜,将液晶透镜分为中央部分和13个菲涅耳旁瓣,每个部分的光程差相同。通过重置电极和微调电极电控调焦,提高液晶透镜的应用范围。对液晶菲涅耳透镜进行了结构设计和仿真研究。通电电极为非完整圆环电极,耦合电极为完整圆环电极。非完整圆环电极与完整圆环电极上下对准,采用电容耦合的方式传递驱动信号,避免引线过孔,可以降低制作液晶透镜的工艺难度。在液晶透镜内设计了方块电阻较低的高阻膜,既可以屏蔽引线电极产生的串扰影响,同时也可以起到均匀压降的作用。通过调节电压,光焦度变化范围为-1~+1 D。液晶菲涅耳透镜可以形成圆对称的折射率分布,与理想光程差的偏差小于λ/4,满足瑞利判断。In this paper,a large aperture liquid crystal Fresnel lens with a diameter of 16 mm is designed.The liquid crystal lens is divided into a central part and 13 Fresnel sidelobes,each of which has the same optical path difference.The structure design and simulation of liquid crystal Fresnel lens are studied.The power electrode is not a complete ring electrode,and the coupling electrode is a complete ring electrode.The non-complete ring electrode is aligned with the complete ring electrode,and the drive signal is transmitted by capacitive coupling to avoid the lead through the hole,which can reduce the difficulty of making liquid crystal lens.A high resistance film with low block resistance is designed in the liquid crystal lens,which can not only shield the crosstalk effect produced by the lead electrode,but also play the role of uniform voltage drop.By adjusting the voltage,the focal power varies from-1 D to+1 D.Liquid crystal Fresnel lens can form a circular symmetric refractive index distribution,and the deviation from the ideal optical path difference is less thanλ/4,which satisfies the Rayleigh judgment.

关 键 词：液晶菲涅耳透镜 大孔径 电容耦合 引线串扰 仿真研究 

分 类 号：O753.2[理学—晶体学]