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采用基于介质高阻硅超材料,设计了太赫兹(THz)波段高效率(>64%)宽带的偏振转换器,并介绍了利用该器件控制相位的方法。采用8个不同尺寸的介质微结构作为控制相位的基本单元,通过恰当地排布它们的空间位置,设计了一个高效率、超宽带的THz波异常偏折器,其有效工作带宽范围为0.75~1.50THz,在1.25THz处效率最高可达70%以上,且偏折角度与频率相关,符合广义斯涅尔定律的描述。实验中,采用了自主搭建的角度分辨的光纤化THz时域频谱系统对设计的器件进行了表征,实验结果和仿真模拟及理论预测结果非常吻合。这种基于介质超材料的方法,克服了传统金属超材料中欧姆损耗的问题,且设计简单,加工方便。
A high efficiency (> 64%) broadband THz band-to-band polarization converter is designed based on dielectric high-resistance silicon metamaterials and a method of controlling the phase using the device is presented. Eight mediums of different sizes are used as the basic units of control phase. By arranging their spatial positions properly, a high efficiency and ultra-wide band THz wave deflector with an effective working bandwidth of 0.75 ~ 1.50THz, at 1.25THz efficiency up to 70% or more, and the deflection angle and frequency-related, in line with the generalized Snell’s law description. In the experiment, the designed device was characterized by using self-built angle-resolved fiber optic THz time-domain spectroscopy system. The experimental results are in good agreement with the simulation results and theoretical predictions. The method based on medium metamaterials overcomes the problem of ohmic loss in the traditional metal metamaterials and has the advantages of simple design and convenient processing.