基于平板电极的非球面组合液体透镜的仿真与实验分析  

Simulation and Experimental Analysis of Aspherical Combined Liquid Lens Based on Flat Electrode

作　　者：孔梅梅[1] 董媛 徐春生 刘悦 薛银燕 李明洋 张舒涵 Kong Meimei;Dong Yuan;Xu Chunsheng;Liu Yue;Xue Yinyan;Li Mingyang;Zhang Shuhan(College of Electronic and Optical Engineering&College of Flecible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;Nanjing NARI Information&Communication Technology Co.,Ltd.,Nanjing 211100,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京南瑞信息通信科技有限公司,江苏南京211100

出　　处：《光学学报》2024年第8期242-248,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61905117,61775102)。

摘　　要：应用介电泳原理设计了一种基于平板电极的非球面组合液体透镜。该透镜主要由上下平行的4块氧化铟锡(ITO)导电平面玻璃板、腔体、介质层和疏水层组成,具有结构简单、易于实现的优点。利用COMSOL、MATLAB和Zemax软件,建立了基于平板电极的非球面组合液体透镜的光学模型,仿真分析了其在不同电压下的焦距变化,并讨论了平板电极的平行度对组合透镜焦距的影响。对该非球面组合透镜的器件制备与实验分析,结果表明:当工作电压由0增加到280 V时,焦距由28.7135 mm变化为20.1943 mm,与仿真结果基本相符;该器件的成像分辨率最高可达49.8244 lp/mm。Objective As an important branch of microfluidic optics,microfluidic optics has become a key technology to promote the development of highly miniaturized and functional optics.Liquid lenses are a common form of microfluidic optical lenses,and as an important part of optical systems,they have obvious advantages over solid lenses,such as a reconfigurable geometry and tunable refractive index.At present,researchers have explored various techniques and tuning mechanisms to make liquid lenses,including fluid pressure lenses,electromagnetic wave lenses,electrowetting lenses and dielectrophoresis lenses.Unlike electrowetting driven liquid lenses,dielectrophoresis driven liquid lenses do not require conducting liquid and do not produce problems such as evaporation or microbubbles.To correct aberrations in practical applications,it is necessary to design a liquid lens with an aspherical surface,which has the advantages of a simple structure and easy realization because of the use of continuous electrodes compared with patterned electrodes.Methods Based on the dielectrophoresis effect,we design an aspherical combined liquid lens based on flat electrode.A certain dielectric constant difference exists between the two liquid materials filled with miscible pairs in the cavity.When the external voltage is applied,the droplet with high dielectric constant will move along the electric field direction and squeeze the droplet with low dielectric constant,and the curvature radius of the liquid-liquid interface will change.By adjusting the voltage applied to the two indium tin oxide(ITO)conductive glass flats in the middle,the curvature radius of the liquid-liquid interface can be changed to adjust the focal length.First,a model of an aspherical combined liquid lens based on a parallel flat electrode under different voltages is built by COMSOL,and the surface profile data of the aspherical interface are obtained.Then,the aspherical surface profile data and aspherical formula are fitted by MATLAB to obtain the corresponding aspherical

关 键 词：光学器件 介电泳原理 非球面 平板电极 液体变焦透镜 

分 类 号：O436[机械工程—光学工程]