Birefringent “generalized refractive” metasurface

A birefringent “generalized refractive” metasurface is synthesized for the first time. This metasurface independently refracts electromagnetic waves with different polarizations to arbitrary directions. The synthesis is performed using a general technique that models the metasurface, assumed to be subwavelength in thickness, by a zero-thickness meta-sheet characterized by electromagnetic susceptibility tensors. As an illustration, a metasurface refracting orthogonally polarized Gaussian beams normally incident on the metasurface to two different directions, without reflection, is demonstrated.