Fig. 2
Metasurface geometry and characterization. a Nanopatch metasurfaces were fabricated by depositing 150 nm (edge length) PVP-coated colloidal silver nanocubes on a 50 nm thick gold film supporting a thin Al2O3 spacer and interrogated with transient absorption spectroscopy. b Image of a metasurface film with an 18 mm diameter and (c) corresponding scanning electron micrograph of discrete nanocubes on the surface (scale bar = 500 nm)
