Barbara Patrizi

1. Introduction Metasurfaces consist of two-dimensional periodic arrangements of sub-wavelength scatterers, or meta-atoms placed on a lattice, that are able to modify the wavefront and/or the polarization distributions of an optical wave [1,2,3]. The optical function of a metasurface basically arises from scattering or absorption of the incident light field on a nanometer scale and the interaction can depend on the light polarization [4].