Ultrathin and Ultra-Broadband Terahertz Single-Layer Metasurface Based on Double-Arrow-Shaped Resonator Structure for Full-Space Wavefront Manipulation,Advanced Theory and Simulations

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Ultrathin and Ultra-Broadband Terahertz Single-Layer Metasurface Based on Double-Arrow-Shaped Resonator Structure for Full-Space Wavefront Manipulation
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2023-04-25 , DOI: 10.1002/adts.202300162
Dongru Yang ₁ , Yongzhi Cheng _{1,

2} , Hui Luo _{1,

2} , Fu Chen _{1,

2} , Ling Wu ₃

Affiliation

In this paper, a simple design of an ultrathin and ultra-broadband single-layer MS based on double-arrow-shaped resonator (DASR) structure for both transmission and reflection modes in terahertz (THz) region is presented. The single-layer MS is composed of a periodic array of the combination of the metal DASR and complementary circular patch (CCP) adhered on an ultrathin dielectric substrate. Numerical results show that the MS structure can convert CP wave to its orthogonal component after reflection and transmission simultaneously, and the corresponding amplitudes are ≈0.45 on average from 0.45 to 1.75 THz with a relative bandwidth of 118.2%, in which the CP conversion efficiency is closing to theoretical limit (25%) of the single-layer structure. Furthermore, the 0–2π phase shifts for the reflected and transmitted orthogonal CP wave can be achieved simultaneously by adjusting the oriented angle (α) of the DASR structure along the wave propagation direction. For the concept proofs, wave beams deflection, vortex beam generation, and focusing effect for both reflection and transmission modes are demonstrated numerically. The design can provide new possibilities and potential to develop multifunctional full-space devices.

中文翻译：

基于双箭头形谐振腔结构的超薄超宽带太赫兹单层超表面全空间波前操控

本文提出了一种基于双箭头形谐振器（DASR）结构的超薄超宽带单层MS的简单设计，适用于太赫兹（THz）区域的传输和反射模式。单层 MS 由金属 DASR 和粘附在超薄介电基板上的互补圆形贴片 (CCP) 组合而成的周期性阵列组成。数值结果表明，MS结构能够同时将CP波反射和透射后转换为其正交分量，在0.45~1.75 THz范围内对应的幅度平均约为0.45，相对带宽为118.2%，其中CP转换效率为接近单层结构的理论极限（25%）。此外，通过调整DASR结构沿波传播方向的定向角（α），可以同时实现反射和透射正交CP波的0-2π相移。为了概念证明，波束偏转、涡旋光束生成以及反射和透射模式的聚焦效果都得到了数值演示。该设计可以为开发多功能全空间设备提供新的可能性和潜力。

更新日期：2023-04-25

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