Vanadium dioxide-assisted terahertz metasurface for broadband polarization conversion and multi-mode vortex beam generation in full-space

IF 2.8 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

The European Physical Journal Plus Pub Date : 2025-05-21 DOI:10.1140/epjp/s13360-025-06377-y

Yupei Tang, You Li, Xunjun He, Ying Zhang

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引用次数: 0

Abstract

In this paper, a terahertz (THz) metasurface for broadband polarization conversion and multi-mode vortex beam generation assisted by vanadium dioxide (VO₂) is proposed. The unit cell is composed of two grating layers parallel to the x-axis and y-axis, respectively, a metal patterned layer, and two dielectric layers. The metal patterned layer consists of a gold cross and a resonant ring with VO₂ filling the opening. In the frequency from 0.26 to 1.32 THz, a cross-polarization conversion rate (PCR) of over 99.9% can be realized, corresponding to a relative bandwidth of 134.2%. By manipulating VO₂ conductivity, dynamic tuning of PCR is obtained. Through precise interlaced phase arrangement by adjusting the angle and width of the metal pattern, three operating modes carrying different functions are formed. While a linear polarization THz wave is incident vertically into the metasurface along the positive and negative directions, respectively, six vortex beam channels with different quantities and topological charges can be achieved. Owing to the orbital angular momentum carried by different vortex beams, the proposed metasurfaces have the potential application prospects in 6G THz communication.

Graphical abstract

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用于全空间宽带偏振转换和多模涡旋光束产生的二氧化钒辅助太赫兹超表面

提出了一种以二氧化钒（VO2）辅助的用于宽带偏振转换和多模涡旋光束产生的太赫兹（THz）超表面。单元电池由两个分别平行于x轴和y轴的光栅层、一个金属图案化层和两个介电层组成。金属图案层由金十字和VO2填充开口的谐振环组成。在0.26 ~ 1.32 THz的频率范围内，可以实现99.9%以上的交叉极化转化率（PCR），相对带宽为134.2%。通过操纵VO2电导率，可以实现PCR的动态调谐。通过调整金属图案的角度和宽度进行精确的交错相位排列，形成三种承载不同功能的工作模式。当线性极化太赫兹波分别沿正负方向垂直入射到超表面时，可获得6个具有不同数量和拓扑电荷的涡旋光束通道。由于不同涡旋光束携带的轨道角动量，所提出的超表面在6G太赫兹通信中具有潜在的应用前景。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The European Physical Journal Plus PHYSICS, MULTIDISCIPLINARY-

CiteScore

5.40

自引率

8.80%

发文量

1150

审稿时长

4-8 weeks

期刊介绍： The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences. The scope of EPJ Plus encompasses a broad landscape of fields and disciplines in the physical and related sciences - such as covered by the topical EPJ journals and with the explicit addition of geophysics, astrophysics, general relativity and cosmology, mathematical and quantum physics, classical and fluid mechanics, accelerator and medical physics, as well as physics techniques applied to any other topics, including energy, environment and cultural heritage.