基于超材料的太赫兹角度滤波器研究

Research on terahertz angular filter based on metamaterial

提出了一种基于超材料的太赫兹低通角度滤波器,该角度滤波器是一种仅允许法向入射太赫兹波透过而将其他方向传播太赫兹波滤除的器件,其结构为螺旋的左右对称开口的金属双环。仿真结果表明,在0.94 THz频率处,该器件的透射效果随着入射角的增大明显降低,且对法向入射的透射率达到94.4%,3 dB角域带宽达到25.0°。所提出的太赫兹角度滤波器在角度波谱分析、雷达数据处理、隐私保护、高信噪比检测器等领域具有重要的应用前景。

In this paper we propose a terahertz lowpass angle filter based on metamaterials,which consists of symmetrical split and spiral resonator.The angle filter is a device that only allows normal incident terahertz waves to pass through and filters out terahertz waves propagating in other directions.The simulation results show that at the frequency of 0.94 THz,the transmission of the device decreases obviously with the increase of the incident angle,and the transmission rate of the vertical incident wave reaches 94.4%,and the 3 dB angular bandwidth reaches 25.0°.The proposed terahertz angle filter has important application prospects in the fields of angle spectrum analysis,radar data processing,privacy protection and detectors with high signal-to-noise ratios.