Affiliation:
1. College of Science, Harbin University of Science and Technology, Harbin 150080, China
2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China
3. Key Laboratory of Engineering Dielectric and Applications, Ministry of Education, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Abstract
Currently, vortex beams are extensively utilized in the information transmission and storage of communication systems due to their additional degree of freedom. However, traditional terahertz metasurfaces only focus on the generation of narrowband vortex beams in reflection or transmission mode, which is unbeneficial for practical applications. Here, we propose and design terahertz metasurface unit cells composed of anisotropic Z-shaped metal structures, two dielectric layers, and a VO2 film layer. By utilizing the Pancharatnam–Berry phase theory, independent control of a full 2π phase over a wide frequency range can be achieved by rotating the unit cell. Moreover, the full-space mode (transmission and reflection) can also be implemented by utilizing the phase transition of VO2 film. Based on the convolution operation, three different terahertz metasurfaces are created to generate vortex beams with different wavefronts in full-space, such as deflected vortex beams, focused vortex beams, and non-diffraction vortex beams. Additionally, the divergences of these vortex beams are also analyzed. Therefore, our designed metasurfaces are capable of efficiently shaping the wavefronts of broadband vortex beams in full-space, making them promising applications for long-distance transmission, high integration, and large capacity in 6G terahertz communications.
Funder
the National Natural Science Foundation of China
the Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments
the Natural Science Foundation of Heilongjiang Province
the Special Projects in Key Fields of Ordinary Universities in Guangdong Province, China
the Project of Innovative and Entrepreneurship Training Program for College Students in Heilongjiang Province
Subject
General Materials Science,General Chemical Engineering
Reference46 articles.
1. Spin-orbit interactions of a circularly polarized vortex beam in paraxial propagation;Yin;Opt. Express,2023
2. High-efficiency transmissive programmable metasurface for multimode OAM generation;Bai;Adv. Opt. Mater.,2020
3. Kotlyar, V.V., Kovalev, A.A., and Telegin, A.M. (2023). Angular and Orbital Angular Momenta in the Tight Focus of a Circularly Polarized Optical Vortex. Photonics, 10.
4. Multifunctional Vortex Beam Generation by a Dynamic Reflective Metasurface;BLiu;Adv. Opt. Mater.,2020
5. Six-Mode Orbital Angular Momentum Generator Enabled by Helicity-Assisted Full-Space Metasurface with Flexible Manipulation of Phase, Polarization, and Spatial Information;Liu;Adv. Opt. Mater.,2022
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