基于超材料的太赫兹光电导天线  

Metamaterials-Based Terahertz Photoconductive Antennas

作　　者：谷建强 王可蒙 许祎 欧阳春梅 田震 韩家广 张伟力 Gu Jianqiang;Wang Kemeng;Xu Yi;Ouyang Chunmei;Tian Zhen;Han Jiaguang;Zhang Weili(Center for THz Waves,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;School of Electrical and Computer Engineering,Oklahoma State University,Stillwater,Oklahoma 74078,America)

机构地区：[1]天津大学精密仪器与光电子工程学院太赫兹研究中心,天津300072 [2]俄克拉荷马州立大学电气与计算机工程学院,俄克拉荷马静水城74078,美国

出　　处：《中国激光》2021年第19期168-188,共21页Chinese Journal of Lasers

基　　金：国家自然科学基金(61975143,61622505,61575141,61307125,61420106006,61422509)。

摘　　要：发展高性能的光电导天线是推动太赫兹科学及其相关技术不断进步的重要手段。系统地介绍了基于金属和介质超材料的高效光电导天线的研究工作,梳理了此类天线的发展历程并展望了其应用前景。关于超材料天线的研究主要是基于两类方法展开的,第一类是利用纳米级金属/介质超材料操控飞秒泵浦激光与光电导天线衬底间的相互作用,第二类方法则是在原有天线结构的基础上设计微米级金属/介质超材料对太赫兹波进行直接操控。这些基于超材料的新方法极大地促进了光电导天线的发展及其在交叉领域的应用。Significance As the cornerstone of terahertz technologies,terahertz radiation sources and detectors have attracted lots of attention.The research on terahertz sources and detectors has run through the entire development of terahertz technologies.In recent years,terahertz technologies have become more closely integrated with other disciplines,which puts forward higher requirements on the sources and the detectors.As the most typical terahertz transmitter and receiver,an photoconductive antennas(PCA)is widely used in laboratories and commercial terahertz systems due to its low request on pump power and compatibility with fiber technologies.The current commercial photoconductive antenna can meet the needs of spectral analysis of thin and low-absorption samples.However,compared with those of solid-state terahertz sources,the power of a PCA is at least two orders of lower.While compared with those of low-temperature thermal detectors,the sensitivity of a detection antennas is also insufficient,not to mention its low-pass filtering effect that is adverse to the detection of high-frequency terahertz waves.Thus,developing a high-performance PCA is an important issue to promote terahertz technologies.Surprisingly,the emergence of metamaterials sheds light on the development of advanced PCAs.With the extremely high degree of design freedom,metamaterials have become one of the mostly concerned artificial electromagnetic media platforms.In the past 20 years,metamaterials have attracted many outstanding researchers in electromagnetics,optics,acoustics,and thermodynamics.Numerous novel functions have been realized one after another,such as negative refractive index,electromagnetic cloak,bounded state in the continuum,perfect absorption,meta-lens,plasmon induced transparency,optical orbital angular momentum coupling,and optical topological insulator.The unique properties of metamaterials can also be used to improve the performance of photoconductive antennas.This review systematically introduces the research works of efficient

关 键 词：太赫兹技术 超快光学 光电导天线 超材料 局域场增强 太赫兹辐射 太赫兹探测 

分 类 号：O434[机械工程—光学工程]