基于太赫兹人工超材料的带阻滤波器

鉴于太赫兹辐射的特殊性，其难以与自然界中多数材料发生电磁相互作用，导致太赫兹功能器件匮乏。人工超材料通过人工设计结构单元的周期排列组合，可实现太赫兹波段电磁响应的调控。本文设计一种由二氧化硅衬底上的单层金属方形谐振环结构构成的太赫兹带阻人工超材料，具有窄带宽、深带阻特性、偏振不敏感特性，通过近场电场和表面电流分析，带阻共振特性源于谐振环结构的电偶极共振。该设计结构简单，易于制备，在太赫兹调制器件、太赫兹通信、光电探测等领域具有应用价值。

A terahertz metamaterial for band-stop filter

It is difficult for the terahertz radiation to interact electromagnetically with most materials in nature due to its spectral specificity, which results in the terrible scarcity of terahertz functional devices. The terahertz metamaterial which is periodic arrangement of artificially designed units with subwavelength, can regulate the electromagnetic response of the terahertz band and become the research hotspot. In this paper, a kind of terahertz band-stop metamaterial with a single-layer metal square resonant ring on silicon dioxide substrate is designed, which has a narrow width and deep band-stop characteristics, and is insensitive to polarization. The band-stop resonance is attributed to the electric dipole resonance in the metal square resonant ring. Moreover, the proposed structure is easy for fabrication, and will be applied in the fields of terahertz modulation devices, THz communication and photoelectric detection.