High index metasurfaces for graded lenses using glide symmetry

A metasurface which has glide symmetry in two orthogonal directions is shown here as the building block for the design of surface wave lenses. This metasurface is shown to have reduced frequency dispersion when compared to a similar structure with reflection symmetry only. This work has the potential to create graded index lenses, with a high mode-index contrast, for use in surface wave antenna applications.