Fig. 3.

Nanoparticle multiplexing for multicolor holograms. (A) Process to design a multicolor hologram through different types of nanoparticles. Two independent holograms are sampled with square grids of nanoparticles and finally multiplexed. (B) Retrieved holograms and corresponding simulated reconstructions for the red and blue colors. (C) BEM simulation of the scattering for the four possible configurations of a diffractive unit with 405- and 650-nm light polarized in the direction of the nanorod axis. The field intensity is normalized and plotted at the nanoparticle boundaries and on a surface 150 nm above the substrate. (D) SEM image of the fabricated scattering hologram containing the two types of nanoparticles at the surface.