(a) Schematic of the optical reflectivity, where the incident light interacts with an AuFON nanostructured system. (b) High-resolution SEM image of a typical AuFON nanostructure with polystyrene nanospheres of 500 nm in diameter. (c) Unit cell of the simulated nanostructured system. The plane wave with TM or TE polarization is incident on the metallic nanostructure. The incidence (θ) and azimuthal (ϕ) angles can be varied in the simulation, as well as the dimensions of the nanostructure.