Precision orbital angular momentum (OAM) multiplexing communication using a metasurface

A novel approach for orbital angular momentum (OAM) multiplexing based communication systems is proposed. This approach utilizes a metasurface to precisely manipulate the phase fronts of the transmitted information-carrying electromagnetic field to form a vortex beam at the receiver location. In contrast to vortex beams generated by other techniques, this beam has not been altered by phase dispersion effects associated with propagation and other factors, such as atmospheric turbulence, which can be compensated for. Since OAM separation takes place only in the spectral domain, the system is not of the multiple-in-multiple-out (MIMO) type.