Flexible Vortex Beam Generation Utilizing a Two-Dimensional Dynamic Metasurface

In recent years, vortex beams have attracted considerable interests owing to the ability to enhance spectral efficiency and channel capacity of communication links. Here, we propose a vortex beam generator using a two-dimensional dynamic reflective metasurface in the microwave domain. Simulations and measurements are carried out at 9.5 GHz for the generation of classical and non-diffracting vortex beams. The spiral phase and ring-shaped magnitude distributions show that the vortex beams carry orbital angular momentum. The proposed dynamic metasurface paves the way to potential applications in smart device and wireless communications.