Controlling light fields with semiconductor metasurfaces: stacking functional layers

Abstract

Stacking of Mie-resonant all-dielectric metasurfaces and other functional layers such as mirrors, spacers or two-dimensional materials offers interesting new opportunities for tailoring the response of the metasurface system. This talk will discuss several examples of such stacked systems, which we have experimentally realized. In particular, chiral bilayer dielectric metasurfaces achieving a record-high chiro-optical response and a resonant dielectric metasurface, which is separated from a metallic mirror by a dielectric spacer layer with a gradually varying thickness will be discussed. Altogether, our results show that the considered stacked photonic systems allow for obtaining important new optical response features and functionalities with respect to single-layer dielectric metasurfaces.