十字形金属结构在太赫兹波段的滤波特性  

Properties of Terahertz Filter Based on Cross Metal Structures

作　　者：魏波[1] 赵国忠[1] 张杲辉[1] 刘立明[1] 

机构地区：[1]首都师范大学物理系,太赫兹光电子学教育部重点实验室,北京市太赫兹波谱与成像重点实验室,北京100048

出　　处：《激光与光电子学进展》2012年第12期164-167,共4页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(50971094)资助课题

摘　　要：实验研究了亚波长十字形金属阵列结构在太赫兹(THz)波段的透射特性。研究表明,在保持十字形金属阵列结构尺度不变的前提下,改变太赫兹波的偏振方向时,其太赫兹透射谱具有无偏窄带滤波特性。大部分太赫兹波可以通过该结构继续传播,仅有很窄带的太赫兹波衰减到极低值,因而产生窄带限波效果。当改变太赫兹波的偏振角度时,透射凹陷所在的频率位置几乎不发生改变,证明该结构在太赫兹波段是一种很好的透射式无偏窄带器件。Cross metal array structure is experimentally studied by terahertz time-domain spectroscopy （THz-TDS）. The results show that this kind of structure have the characteristic of non-polarized narrow band filtering. Most terahertz wave can pass through the cross metal array structure. However, the terahertz wave with certain frequencies is restrained by the structure. Moreover, the change of polarization angle does not affect the position of transmission dip. It is proved that the structure is a good non-polarized transmission and filtering device in the terahertz band. These results provide a good reference for the research and fabrication of terahertz sub-wavelength optical components.

关 键 词：薄膜 太赫兹波 透射特性 十字形金属阵列 太赫兹时域光谱系统 

分 类 号：O434[机械工程—光学工程]