Optical metasurfaces based on spheroidal nanoparticles: Theory and applications

In this paper, we review our recent results about the theoretical modeling and the possible applications of optical metasurfaces made of arrays of spheroidal nanoparticles. We consider both the case of plasmonic and dielectric nanoparticles, and we show how their peculiar responses in the visible range make them plausible candidates for several innovative nanophotonic applications. We also show that the coupled dipole model allows properly homogenizing both these classes of metasurfaces, and understanding the effects of the geometrical parameters and material properties of their macroscopic optical response. The results of full-wave simulations are also reported to confirm the effectiveness of the theoretical findings.