光控电磁超表面太赫兹调制器的研究  

Photo-Excited Terahertz Modulator Based on Electromagnetic Metasurface

作　　者：梁兰菊[1,2] 闫昕[1,2] 姚建铨[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]枣庄学院光电工程学院,山东枣庄277160

出　　处：《枣庄学院学报》2016年第2期10-13,共4页Journal of Zaozhuang University

基　　金：国家自然科学基金(项目编号:61271066);中国博士后科学基金(项目编号:2015M571263);山东省高等学校科技计划项目(项目编号:J15LN36);枣庄学院博士基金;枣庄学院"光电科学与技术"科研创新团队资助的课题

摘　　要：本论文利用光敏硅的可变电导率特性,设计了一种基于光控的电磁超表面宽带太赫兹调制器.电磁超表面由金属薄膜、隔离层以及具有光敏硅的特殊结构组成.光敏硅的电导率从1 S/m变为2×105S/m时,谐振频率从1.4 THz变到1.0 THz,其反射率从-5 d B变到-38d B,频移为0.3 THz,振幅调制深度接近100%,并且电磁超表面的反射率小于-10 d B的带宽从0变为0.64 THz,实现宽频带低反射主要与相邻结构单元的反射相位差有关系.该电磁超表面结构为大范围、宽频带的太赫兹调制器提供了一种新的思路和途径,将在通信、国防、成像等方面有重要的应用前景.We designed a photo-excited broadband terahertz modulation based on electromagnetic metasurface using the tunable conductivity photosensitive silicon.The metasurface consists of a special structure with hybrid photosensitive silicon and a metallic ground plane that are separated by a dielectric spacer.The resonance frequency can be varied from 1.4 THz to 1.0THz when the silicon conductivity ranges from 1 S / m to 2 × 105 S / m,and the reflectivity varies from-5 d B to-38 d B.The frequency shift is 0.3 THz,and the amplitude modulation depth reaches almost 100 % at the resonance frequency.Aband width of reflectivity less than 10 d B for the metasurface is achieved from 0 to 0.64 THz,and the result related to the reflection phase difference of adjacent structure units.The metasurface provide a new approach to achieved wide bandwidth and range terahertz modulation and have the numerous potential applications in the development of broadband communication,military radar,medical image and so on.

关 键 词：太赫兹 调制器 光控 宽频带 

分 类 号：O441[理学—电磁学] TB34[理学—物理]