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首页> 美国卫生研究院文献>Scientific Reports >Double-stacked hyperbolic metamaterial waveguide arrays for efficient and broadband terahertz quarter-wave plates
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Double-stacked hyperbolic metamaterial waveguide arrays for efficient and broadband terahertz quarter-wave plates

机译：用于高效和宽带太赫兹四分之一波片的双堆叠双曲超材料波导阵列

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摘要

We demonstrate how it is possible to achieve weak dispersion in the phase delay between two orthogonal polarization states by using double-stacked hyperbolic metamaterial (HMM) waveguide arrays. The weak dispersion in the phase delay originates from the different signs of phase delay from the two different HMM waveguide arrays. The condition of dispersion-free phase delay for the transmitted waves has been theoretically derived from the transmission matrix as the propagation characteristic of the HMM waveguide is involved. We further reveal that the designed double-stacked HMM waveguide array can function as an efficient quarter-wave plate that enables the conversion of linearly polarized light to circularly polarized light within a broad frequency band. In addition, the bandwidth over which the degree of linear polarization is nearly unity and over which the angle of linear polarization is kept at approximately 45° is basically consistent with the phase bandwidth. This offers a promising approach for developing a practical polarization converter in the terahertz domain.
机译：我们演示了如何通过使用双堆叠双曲线超材料（HMM）波导阵列在两个正交极化状态之间的相位延迟中实现弱色散。相位延迟中的弱色散源于来自两个不同的HMM波导阵列的相位延迟的不同符号。由于涉及HMM波导的传播特性，理论上已从传输矩阵推导了传输波的无色散相位延迟条件。我们进一步揭示，设计的双堆叠HMM波导阵列可以充当有效的四分之一波片，从而能够在宽频带内将线性偏振光转换为圆形偏振光。另外，线性极化程度几乎为1且线性极化角度保持为约45°的带宽与相位带宽基本一致。这为开发太赫兹域中的实用偏振转换器提供了一种有前途的方法。

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