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Ultra-broadband and wide-angle terahertz polarization converter based on symmetrical anchor-shaped metamaterial

机译：基于对称锚定形超材料的超宽带和广角太赫兹极化转换器

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摘要

We propose a reflective terahertz metamaterial linear polarization converter, consisting of three layers: an array of metallic symmetrical anchor-shaped resonators, poly tetra fluoroethylene (PTFE) as a low loss dielectric layer, and a metal surface ground plane. The simulation results show that the proposed metamaterial can convert the linearly polarized waves into the cross-polarized waves with a polarization conversion ratio (PCR) of above 93% in the frequency range of 1.21-2.83 THz and the relative bandwidth is as high as 80.2%. The proposed metamaterial is valid for a wide range of incident angles, and the average polarization conversion ratio remains 93% even though the incident angle reaches 45 degrees. Additionally, we theoretically analyzed the conversion mechanism of achieving a high-efficiency linear polarization conversion in a wide frequency range by calculating the polarization angle and elliptical angle of the reflected terahertz waves. The experiment results using the terahertz time domain spectroscopy (THz-TDS) consist well with the simulation results. Our design will provide an important reference for the practical applications of the metamaterials in polarization manipulation.
机译：我们提出了一种反射太赫兹超材料线性偏振化转换器，由三层组成：金属对称锚定谐振器阵列，聚四氟乙烯（PTFE）作为低损耗介电层，以及金属表面接地平面。仿真结果表明，所提出的超材料可以将线性偏振波转化为偏振转换比（PCR）在1.21-2.83至8周的频率范围内高于93％的偏振波，相对带宽高达80.2 ％。所提出的超材料对于广泛的入射角有效，即使入射角达到45度，平均偏振转换比率也保持93％。另外，我们通过计算反射的太赫兹波的偏振角和椭圆角来实现在宽频率范围内实现高效率线性极化转换的转换机制。使用Terahertz时域光谱（THz-TDS）的实验结果与仿真结果很好。我们的设计将为超级材料在极化操作中的实际应用提供重要参考。

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  • 来源
    《Optical Materials》 |2020年第9期|110062.1-110062.8|共8页
  • 作者

    Zou Mengqiang; Su Miyong; Yu Hua;

  • 作者单位

    Guilin Univ Elect Technol Acad Marine Engn Beihai 536000 Peoples R China;

    Guilin Univ Elect Technol Acad Marine Engn Beihai 536000 Peoples R China;

    Guilin Univ Elect Technol Acad Marine Engn Beihai 536000 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Terahertz; Metamaterial; Polarization converter; Wide angle;

    机译：太赫兹;超材料;极化转换器;广角;

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