Transmission properties of resonant metasurfaces in the presence of nearby interacting sources

The electromagnetic problem consisting in the interaction between a elemental point source and a resonant metasurface is investigated. A recently introduced semianalytical approach is adopted to take into account all the propagating and evanescent waves which constitute the spectrum of the point source and all the propagating and evanescent Floquet modes which constitute the spectrum of the diffracted field by the periodic structure: the main differences with respect to a conventional plane-wave source are pointed out, especially in terms of resonant frequencies, operating bandwidth, and transmission levels.