Security devices and optically variable devices in the nature of diffractive optical elements, diffraction gratings and other surface-based diffractive structures, holograms, interference filters, holographic filters, polarization filters, embossed films, optical thin films, multilayer films, iridescent holographic security layers, reflective layers, and liquid crystals used for bank notes, checks, credit cards, and other security and identification documents, namely, passports, identity card...