This paper presents a terahertz beam splitter based on an "I" type double open ring structure. Its structure unit is a typical metal-medium-metal structure; the top metal pattern comprises an "I" type double open ring, and the bottom layer is a continuous metal plate. The phase gradient metasurface of 8 × 8 is formed by changing the opening size and radius of the I-shaped double-open ring. When a y-polarized wave is an incident vertically along the -z-axis and the +z axis, respectively, the y-polarized waves will be divided into four beams with different energy distributions along the x and y-axis, and two different beam splitting ratios can be obtained from the two incident modes. In 0.7 THz, when the y polarized waves are incident vertically along the -z-axis and +z axis, the beam splitting ratio is 0.8 and 2.1, respectively, and the beam splitting ratio is tuned. This terahertz beam splitter has the advantages of small size and low cost and can be used in terahertz communication, terahertz imaging, terahertz stealth, and other fields.

中文翻译：

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基于工字型双开环结构的太赫兹分束器设计

本文提出了一种基于“I”型双开环结构的太赫兹分束器。其结构单元是典型的金属-介质-金属结构；顶层金属图案包括“I”型双开环，底层为连续金属板。通过改变工字双开环的开口尺寸和半径，形成8×8的相位梯度超表面。当 y 偏振波分别沿 -z 轴和 +z 轴垂直入射时，y 偏振波将被分成沿 x 轴和 y 轴能量分布不同的 4 束光束，并且 2 束不同的能量分布。可以从两种入射模式获得分束比。在0.7 THz下，当y偏振波沿-z轴和+z轴垂直入射时，分束比分别为0.8和2.1，并且分束比可调谐。该太赫兹分束器具有体积小、成本低的优点，可应用于太赫兹通信、太赫兹成像、太赫兹隐身等领域。