可调谐太赫兹液晶超表面  

Overview of active terahertz metasurface devices based on liquid crystal

作　　者：申彦春 徐雅倩 胡伟[2] SHEN Yanchun;XU Yaqian;HU Wei(Information Engineering Institute,Guangzhou Railway Polytechnic,Guangzhou 511300 China;College of Engineering and Applied Sciences,Nanjing University,Nanjing 210023,China)

机构地区：[1]广州铁路职业技术学院信息工程学院,广东广州511300 [2]南京大学现代工程与应用科学学院,江苏南京210023

出　　处：《液晶与显示》2025年第3期407-423,共17页Chinese Journal of Liquid Crystals and Displays

基　　金：广州市教育局高校科研项目(No.202235053)。

摘　　要：超表面极大地丰富了光与物质的相互作用,促进了平面光学的发展。近年来,随着太赫兹(THz)技术的快速发展,动态可调谐太赫兹器件得到了广泛研究。液晶(Liquid Crystal,LC)是一种独特的软物质,兼具液体的流动性和晶体的各向异性,是显示和空间光调制中不可或缺的材料。液晶与超表面集成可以实现动态太赫兹器件。本文从3方面综述了太赫兹液晶超表面的研究进展:液晶平面太赫兹器件、液晶集成金属超表面及液晶集成电介质超表面,介绍了制备液晶微结构及液晶集成金属或电介质超表面的相关技术,展示了液晶超表面器件对电场、磁场、热和光等外部刺激的优异响应性,利用外场实现了对太赫兹波振幅、频率、相位和偏振态的动态调控。可调太赫兹液晶超表面将显著推动太赫兹在成像、通信和传感领域中的应用。Metasurface devices greatly enrich the interaction between light and matter,promoting the development of planar optics.In recent years,with the rapid development of terahertz(THz)technology,dynamically tunable terahertz devices have been widely studied.Liquid crystal(LC)is a unique soft matter that combines the fluidity of liquids and the order of crystals,making it indispensable in the field of displays and spatial light modulations.The integration of liquid crystals and metasurfaces enables tunable terahertz devices.In this review,we summarize three types of liquid-crystal based terahertz metasurfaces and their research progress,including liquid crystal planar terahertz devices,liquid crystal integrated metal metasurfaces,and liquid crystal integrated dielectric metasurfaces.Furthermore,techniques for fabricating liquid crystal microstructures as well as liquid-crystal integrated metal or dielectric metasurfaces are introduced.Due to the excellent responsiveness of liquid crystal metasurfaces to external stimuli including electric fields,magnetic fields,heat and light,the amplitude,frequency,phase,and polarization state of terahertz waves are dynamically manipulated.The tunable terahertz metasurface devices based on liquid crystals drastically promote the application of terahertz in imaging,communication,and sensing fields.

关 键 词：液晶 超表面 太赫兹 可调谐器件 

分 类 号：O436.2[机械工程—光学工程] O438.1[理学—光学]