Abstract
Thanks to switchable wavefronts, design methods of diverse functions are greatly enriched. However, less attention has been paid to multichannel switchable orbital angular momentums (OAMs) of metasurfaces in previous reports. In this work, a spin-selective metasurface enabling multichannel switchable OAMs is proposed in terahertz band. This metasurface is designed based on the phase change property of vanadium dioxide (VO2). Firstly, when VO2 is metal, vortex beam with topological charge of l = 2 is achieved under left-handed circular polarization (LCP) incidence. Under right-handed circular polarization (RCP) incidence, the obtained vortex beam has a topological charge of l = -3. Secondly, when VO2 is changed to insulator, function of the metasurface is correspondingly switched. Under LCP and RCP incidences, vortex beams are realized with topological charges of l = 3 and l = -2. Therefore, the designed metasurface as a multichannel vortex beam generator has switchable characteristic. Our design shows great promise in the integration of multifunctional devices.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
