Fig. 1: Image encoding and the three-level plasmonic system.
From: Covert infrared image encoding through imprinted plasmonic cavities
a Schematic of the cavity-coupled plasmonic device consists of a backmirror, an imprinted array of holes in a polymer, and a second evaporation of gold to create disks and a perforated film. b A false-colored scanning electron microscope image of the plasmonic system and a schematic with the various structural parameters. c An encoded surface where pixel data are mapped to structural features of the plasmonic system. The spectral axis shows how the data can manifest in the desired wavelength range, as shown in the shortwave infrared window, whereas the surface remains uniform in other windows
