Terahertz Transmission-Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation,Advanced Theory and Simulations

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Terahertz Transmission-Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2022-06-01 , DOI: 10.1002/adts.202200151
Jun Li ₁ , Yongzhi Cheng ₁ , Xiangcheng Li ₂

Affiliation

A transmission-type metasurface (MS) based on the combined geometric and transmission phase is proposed and investigated here numerically, which can achieve independently manipulation of the circular polarization (CP) and linear polarization (LP) wavefront at terahertz (THz) region. The unit-cell of the proposed MS is composed of the dielectric substrate sandwiched with the bilayered inner centrosymmetric-notched-elliptic (CNE), outer C-shaped, and single-split-ring (SSR) structures. The proposed MS can convert the normal incident LP wave to its orthogonal one at the lower frequency (f₁ = 0.68 THz) after transmission and left-handed circular polarization to the transmitted right-handed circular polarization wave or vice versa at the higher frequency (f₂ = 1.34 THz). The full 2π phase shifts of the both transmitted LP and CP waves can be realized independently and simultaneously by varying the opening and orientation angles of the outer SSR structure based on the transmission phase and the orientation angle of the inner CNE structure based on geometric phase, respectively. As proofs of concept, anomalous refraction, planar focusing, and vortex beam generation for both LP and CP waves are demonstrated numerically. These findings show great potential applications in imaging and communication systems, providing new possibilities to develop multifunctional THz device for both LP and CP waves.

中文翻译：

用于线性和圆偏振波前操纵的太赫兹透射型超表面

本文提出了一种基于组合几何和透射相位的透射型超表面（MS），并对其进行了数值研究，可以实现对太赫兹（THz）区域的圆偏振（CP）和线性偏振（LP）波前的独立操纵。所提出的 MS 的晶胞由夹在双层内部中心对称缺口椭圆 (CNE)、外部 C 形和单裂环 (SSR) 结构的介电基板组成。所提出的 MS 可以在传输后将法向入射 LP 波转换为较低频率（f ₁ = 0.68 THz）的正交波，并将左旋圆极化转换为透射的右旋圆极化波，反之亦然。f ₂ = 1.34 太赫兹）。通过基于传输相位改变外部 SSR 结构的开口和取向角以及基于几何相位改变内部 CNE 结构的取向角，可以独立且同时地实现传输的 LP 波和 CP 波的全 2π 相移，分别。作为概念验证，LP 和 CP 波的反常折射、平面聚焦和涡流光束生成都以数值方式进行了演示。这些发现在成像和通信系统中显示出巨大的潜在应用，为开发用于 LP 和 CP 波的多功能太赫兹设备提供了新的可能性。

更新日期：2022-06-01

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