Multichannel Metasurfaces for Anticounterfeiting

Abstract

Much effort has been devoted to anticounterfeiting technologies, and recent advances in metasurfaces have provided further opportunities to realize holograms with unique properties. This work demonstrates a multichannel metasurface device that can reconstruct helicity-multiplexed holographic images and hide a grayscale image in the polarization profile of a light beam. The feasibility study of a multichannel device based on independent control of phase and polarization shows this technique to be very attractive for compact optical devices with multiple functionalities for encryption and high-level anticounterfeiting.