Optical anticounterfeiting photonic bilayer film based on handedness of solid-state helicoidal structure

Anticounterfeiting photonic bilayer films were fabricated by sandwiching two solid-state cholesteric liquid crystal films having different handedness. The fabricated photonic bilayer films were successfully applied to patterning by selective photopolymerization. This photonic bilayer film as a new cryptographic technology is of interest for its anticounterfeiting application. Anticounterfeiting photonic bilayer DH-CLC solid films were fabricated by sandwiching two CLC solid films having different handedness. The encrypted information is only disclosed under right-handed circular polarized light.