T形结构太赫兹超材料吸收器的设计与仿真

Design and Simulation of T-Shaped Terahertz Metamaterial Absorber

太赫兹频段的超材料吸收器可广泛应用于军事雷达及生物检测等方面。提出了T形结构的太赫兹超材料吸收器,其吸收率可达99.99%以上,接近完美吸收,并从结构尺寸及电流分布等方面说明了此结构的吸收率影响因素及吸波机理。为了使上述T形结构的适用范围更广,进一步提出了极化不敏感T形吸收器及频率可调T形吸收器。仿真结果表明,所设计的超材料吸收器具有较高的吸收率、较灵活的频率调节范围和不敏感的极化角度,具有较好的研究价值。

Metamaterial absorbers in terahertz band can be widely used in military radar and biological detection.In this paper,a terahertz metamaterial absorber with a T-shape structure is proposed.Its absorptivity can reach 99.99%,close to perfect absorption.The factors influencing absorptivity and the absorptivity mechanism of the structure are disclosed from the aspects of structural size and current distribution.In order to make the above T-shaped structure apply to a wider range,the designs of a polarization-insensitive T-shaped absorber and a frequency-adjustable Tshaped structure absorber are further proposed.The simulation shows that the designed metamaterial absorber has high absorptivity,flexible frequency adjustment range,and insensitive polarization angle,so it has good research value.