Polarization-preserving vortex beam and tunable focusing terahertz metasurfaces based on twin rectangular graphene patterns

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-04-20 DOI:10.1016/j.diamond.2025.112348

Jiu-sheng Li, Ri-hui Xiong, Feng-lei Guo

引用次数: 0

Abstract

In order to overcome the dependence between phase modulation and incident wave polarization state, we propose a new metasurface based on twin rectangular graphene patterns. Without changing the incident wave polarization state, it can generate splitting vortex beams with variable topological charges (l = ± 1, ± 2, and ± 3), and can also serve as a focusing lens with variable focal length and focal position. By changing the Fermi level of graphene in different regions, the proposed metasurface obtains topologically adjustable vortex beams and variable focal length terahertz focusing, which becomes very flexible and simple. This dynamic polarization-preserving vortex beam and tunable focusing strategy shows great potential for flexible signal manipulation and processing in terahertz region.

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基于孪生矩形石墨烯图案的偏振保全涡流束和可调谐聚焦太赫兹元表面

为了克服相位调制与入射波偏振态之间的依赖关系，我们提出了一种基于双矩形石墨烯图案的新型超表面。在不改变入射波偏振态的情况下，它可以产生具有可变拓扑电荷（l =±1、±2和±3）的分裂涡旋光束，也可以作为可变焦距和焦位的聚焦透镜。通过改变石墨烯在不同区域的费米能级，所提出的超表面获得拓扑可调涡旋光束和变焦距太赫兹聚焦，变得非常灵活和简单。这种动态保偏涡旋光束和可调聚焦策略在太赫兹区域的柔性信号处理和处理中显示出巨大的潜力。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.