Terahertz Vortex Wave Generation and Reversible Beam Switching based on Coding Metasurface

CHEN Xi; YANG Zhixiong; WANG Jingli; CHEN Heming

doi:10.13756/j.gtxyj.2025.240181

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Terahertz Vortex Wave Generation and Reversible Beam Switching based on Coding Metasurface

更新时间：2025-12-25

- Terahertz Vortex Wave Generation and Reversible Beam Switching based on Coding Metasurface
- Study on Optical Communications Issue 6, (2025)
- 作者机构：
  
  1.江苏开放大学（江苏城市职业学院），南京　210008
  2.南京邮电大学　电子与光学工程学院、柔性电子（未来技术）学院，南京　210023
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.240181
  CLC： O436
- Received：21 August 2024，
  
  Revised：2024-11-18，
  
  Published：10 December 2025
- 稿件说明：
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陈希，杨志雄，汪静丽，等. 编码超表面产生太赫兹涡旋波及可逆波束切换[J]. 光通信研究，2025(6): 240181.

Chen X, Yang Z X, Wang J L, et al. Terahertz Vortex Wave Generation and Reversible Beam Switching based on Coding Metasurface[J]. Study on Optical Communications, 2025(6): 240181.
陈希，杨志雄，汪静丽，等. 编码超表面产生太赫兹涡旋波及可逆波束切换[J]. 光通信研究，2025(6): 240181. DOI： 10.13756/j.gtxyj.2025.240181.

Chen X, Yang Z X, Wang J L, et al. Terahertz Vortex Wave Generation and Reversible Beam Switching based on Coding Metasurface[J]. Study on Optical Communications, 2025(6): 240181. DOI： 10.13756/j.gtxyj.2025.240181.

摘要

【目的】

太赫兹涡旋波在宽带通信、军事雷达、生物医疗和检测等领域具有广泛的应用前景，但利用传统太赫兹器件实现波束调控存在结构复杂、尺寸较大和可调谐性差等问题。针对这些问题，文章基于光敏硅的电导率可调性，提出了一种调控太赫兹波产生涡旋波及可逆波束切换的编码超表面。

【方法】

该超表面为3层结构，其顶层是金属-光敏硅复合结构，中间层为二氧化硅层，底部为金属层。编码超表面所产生的波束形式是由组成其的编码超表面单元按照一定编码序列排列而决定的。通过改变光敏硅电导率，可以实现单元性质的改变，进而在同一编码超表面上呈现相反的编码序列。通过调控太赫兹波可以实现涡旋波的产生及可逆波束的切换。

【结果】

仿真结果表明，通过改变光敏硅的电导率，同一编码超表面在两种不同的编码序列下均可以产生反射幅度较高的涡旋波束，且拓扑荷数相反，实现了拓扑荷数分别为

=1的涡旋波束以及

=-1的可逆波束。

【结论】

文章以产生应用前景较好的涡旋波为例设计了相关编码序列，产生了太赫兹涡旋波及可逆波束切换，在一定程度上提高了编码超表面调控太赫兹波的能力。这对太赫兹涡旋波通信及信息处理具有重要意义。

Abstract

【Objective】

Terahertz vortex waves have a wide range of applications in the fields of broadband communications

military radar

biomedicine and detection

etc. However

the realization of beam modulation using traditional terahertz devices suffers from structural complexity

large size and poor tunability. To solve these problems

this paper proposes a terahertz coding metasurface that can modulate terahertz waves to achieve reversible beam switching. The design is based on the tunable conductivity of photosensitive silicon.

【Methods】

The metasurface has a three-layer structure. Its top layer is metal photosensitive silicon composite structure

middle layer is the silicon dioxide layer

and the bottom layer is the metal layer. The beamform generated by the coding metasurface is determined by the coding metasurface units and coding sequence. By changing the conductivity of the photosensitive silicon

the change in the unit properties can be realized

and then the opposite coding sequence on the same coded metasurface are presented. The modulation of the terahertz wave can realize vortex wave generation and reversible beam switching.

【Results】

Simulation results show that the same coded metasurface can produce vortex beams with higher reflection amplitude and opposite topological charges under two different coding sequences. A vortex beam with topological charge

=1 and a reversible beam with

=-1 are realized by adjusting the conductivity of the photosensitive silicon. By adjusting the conductivity of photosensitive silicon on the same coding metasurface

the reversible beamform switching is achieved.

【Conclusion】

This paper takes the generation of vortex beams with good application prospects as an example to design relevant coding sequences

achieving the generation of terahertz vortex beams and reversible beam switching

which improves the ability of the coding metasurface to manipulate terahertz waves to a certain extent. This is of great significance for terahertz vortex beam communication and information processing.

关键词

Keywords

references

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