“…In integrated photonics, planar nanogratings coupled with optical waveguides exploit the diffraction phenomenon for routing portions of the guided light in and out of the optical chip [4], [5], [6], [7]. In plasmonics, light interaction with 2D metal periodic nanoarrays is used for surface plasmon resonance (SPR) and induces phenomena such as fluorescence, dichroism, and Raman scattering [8], [9], [10]. Such structures are implemented for applications spanning from signal treatment and routing, to biomolecular sensing, at times aided by chemical functionalization [11], [12], [13], [14].…”