Dual-polarization reconfigurable metasurface for broadband vortex beam generation

Recently, reconfigurable metasurfaces integrated with adaptable devices have demonstrated exceptional dynamic controllability across various applications, garnering considerable attention. However, many reported metasurfaces, particularly those supporting dual-polarization adjustability, exhibit limited broadband electromagnetic performance. To address this limitation, we propose a dual-polarized reconfigurable intelligent surface (RIS) with a distinctive metal layer design. Our prototype, which consists of 6 x 6 units, has been experimentally validated for its broadband performance. This RIS enables simultaneous beam control, including both beam deflection and vortex beam generation, over a frequency range from 1.8 to 2.4 GHz, achieving a fractional bandwidth of 28.6% for dual-polarized waves. By expanding polarization functionality, our work provides a solution for enhancing channel capacity in communication systems, presenting promising applications in wireless communication. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement