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基于石墨烯和二氧化钒超表面的宽带多功能偏振转换器及其分析方法

Broadband multifunctional polarization converter based on graphene and vanadium dioxide metasurfaces along with analytical methods.

作者信息

Heidari Saman, Nozhat Najmeh

机构信息

Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran.

出版信息

Sci Rep. 2025 May 6;15(1):15856. doi: 10.1038/s41598-025-00805-w.

DOI:10.1038/s41598-025-00805-w
PMID:40328856
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12055999/
Abstract

In this paper, a tunable broadband multifunctional polarization converter based on graphene and vanadium dioxide (VO) is designed. When VO is in the metallic state, the structure has the functions of three-band linear to linear and two-band linear to circular polarization conversion. In the broadband frequency range of 15.05 to 16.66 THz, the ellipticity is more than 0.9. Moreover, the structure has circular to linear and two-band circular to circular polarization conversion functions. For the insulating state of VO, the structure has the performance of two-band linear to linear and three-band linear to circular polarization conversion. The surface current distribution of the polarization converter is studied to better understanding the physical mechanism of the structure. In addition, the effects of incident and polarization angles and geometrical parameters on the polarization conversion performance are investigated. By changing the chemical potential of graphene, the structure can switch between different polarization conversion functions. It is shown that the performance of the converter is independent of the incident angle up to about 40°. To verify the simulation results, theoretical analyses of multiple interference theory and equivalent circuit model are presented. The proposed structure with features such as adjustability, multiple polarization conversion functions, broad bandwidth, stability over wide incident angle, and ease of construction has potential applications in radar detection, stealth technology, imaging systems, and sensing.

摘要

本文设计了一种基于石墨烯和二氧化钒（VO）的可调谐宽带多功能偏振转换器。当VO处于金属态时，该结构具有三波段线性到线性以及两波段线性到圆偏振转换功能。在15.05至16.66太赫兹的宽带频率范围内，椭圆率大于0.9。此外，该结构还具有圆到线性以及两波段圆到圆偏振转换功能。对于VO的绝缘态，该结构具有两波段线性到线性以及三波段线性到圆偏振转换性能。研究了偏振转换器的表面电流分布，以更好地理解该结构的物理机制。此外，还研究了入射角、偏振角和几何参数对偏振转换性能的影响。通过改变石墨烯的化学势，该结构可以在不同的偏振转换功能之间切换。结果表明，该转换器的性能在入射角约40°以内与入射角无关。为了验证仿真结果，给出了多干涉理论和等效电路模型的理论分析。所提出的结构具有可调谐性、多种偏振转换功能、宽带宽、在宽入射角范围内稳定性好以及易于构建等特点，在雷达探测、隐身技术、成像系统和传感等方面具有潜在应用。

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本文引用的文献

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Reconfigurable broadband metasurfaces with nearly perfect absorption and high efficiency polarization conversion in THz range.太赫兹波段具有近乎完美吸收和高效偏振转换的可重构宽带超表面
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