Millimeter-Wave Transmit-Arrays for Vector Vortex Beam Generation

In this paper, we present two designs of millimeter-wave transmit-arrays for producing multiple vector vortex beams that are generalized waveforms of cylindrical vortex beams with inhomogeneous polarization states across their wavefront. The first one exploits only the Berry phase while the second one utilizes both the Berry phase and dynamic phase. The proposed methods can be useful for generating complex beams with structured wavefronts from microwave frequencies to optical wavelengths.