Omega Bianisotropic Metasurfaces as Huygens’ Metasurfaces with Anti-Reflective Coatings

Omega bianisotropic metasurfaces (OBMS) are capable of producing perfect wide angle anomalous refraction, a feat previously impossible with Huygens' metasurfaces (HMS). Using a geometrical optics model, it is shown that an HMS with an anti-reflective coating can produce the same perfectly refracted field as the OBMS. A realistic design for such a coating is presented for use with a Fabry-Perot HMS. Full-wave calculations not only validate this combination as a new approach for attaining perfect anomalous refraction, but also demonstrate improved angular response.