Fig. 9From: Plasmonic- and dielectric-based structural coloring: from fundamentals to practical applicationsa (Left) schematic diagram of plasmonic cell consisting of Mg NPs. White unpolarized light incident on the plasmonic cell in normal direction. H2 exposure erases the color; O2 restores it. (Right) color palettes as a function of d and ln(t). b (Left) Time-varying color erasing and restoring of fabricated image. (Right) SEM image of the fabricated sample [131]. c (Top) Schematic diagram of proposed dynamic stepwise cavity resonators. Upon H2 exposure, color information is shown; O2 exposure erases the color; H2 restores it. (Bottom) cross section view of unit Fabry-Pérot resonator. Under H2, a double dielectric spacer is formed and the TiH2/PdH layer transmits incident light. d (Top) Vincent van Gogh’s Starry Night and fabricated SEM image. (Bottom) color erasing and restoring processes as a function of H2 and O2 exposure time [132]Back to article page