Generation of Broadband Multiple OAM Modes Using Pancharatnam-Berry Metasurface

Abstract

Vortex beams carrying orbital angular momentum (OAM) have been extensively realized using different approaches. Here, we present a Pancharatnam-Berry (PB) metasurface to generate broadband multiple vortex beams, which can carry different OAM modes towards different directions. The proposed PB metasurface could control the circularly polarized incident waves by attaching geometric phase to the orientation angle of the anisotropic meta-atoms. This design is numerically demonstrated at Ku band (12–18 GHz) and can be further exploited for OAM multiplexing in the communication systems.