Figure 3
RGB plasmonic pixel design: (a,b) Gradient spacing spirals under SEM and optical microscope under two orthogonal polarizations conditions for the analyzer (unpolarized incident). (c) SEM images of RGB pixel design, schematically shown in (e), at varying magnifications. (d) Optical characterization of an array of plasmonic pixels exhibiting RGB colors under varying polarization conditions (normalized to Al mirror) and (f) the associated reflection measurements of the main unit cell with orthogonal polarization conditions. This displays either thin-film silver reflection or dual-mode resonant absorption (color filtering) depending on analyzer condition.
