物理学报Issue(17)：1-9,9.DOI:10.7498/aps.63.178103
基于超材料的偏振不敏感太赫兹宽带吸波体设计
Design of a polarization-insensitive and broadband terahertz absorber using metamaterials
摘要
Abstract
A polarization-insensitive and broadband terahertz (THz) absorber based on metamaterial (MM) is presented. The absorber consists of two layers of metal and a single layer of medium. Each periodic cell of the upper metallic layer consists of five different sizes of metal patches which form a square array of 5×5. In the array, the size of each metal patch is different from that of its adjacent one, and each size of the metal patch generates a single resonance absorption peak. The broadband absorption is actually produced by the overlapping of five adjacent resonance absorption peaks. By studying the distribution of the surface current and the z-component of electric field, it is easy to know that the energy of the incident THz wave is absorbed by two factors: one is the electric dipole oscillation caused by the electric field in the y direction, and the other is the magnetic polariton caused by the magnetic field in the z direction. And the ohmic loss of metal layers plays a major role on the absorption of the absorber. Simulation results show that the bandwidth achieves 1.2 THz for the absorption beyond 80%, and the maximum absorption is up to 98.7%. It’s full width at half maximum (FWHM) is 1.6 THz, and the thickness of the broadband absorber is only about one twentieth of the center wavelength. In addition, the absorber is insensitive to the polarization and has a wide-angle feature, and the potential applications of the absorber are electromagnetic stealth, THz thermal radiation detectors, and THz communication.关键词
超材料/太赫兹吸波体/偏振不敏感/宽带吸收Key words
metamaterial (MM)/terahertz (THz) absorber/polarization insensitive/broadband absorption引用本文复制引用
邹涛波,胡放荣,肖靖,张隆辉,刘芳,陈涛,牛军浩,熊显名..基于超材料的偏振不敏感太赫兹宽带吸波体设计[J].物理学报,2014,(17):1-9,9.基金项目
国家自然科学基金(批准号:61265005)、广西信息科学实验中心项目(批准号20130101)、广西自动检测技术与仪器重点实验室项目(批准号：YQ14114)、广西研究生教育创新计划资助项目(批准号：YCSZ2014141)和桂林电子科技大学创新团队项目资助的课题 （批准号:61265005）
