Ellipticity-encrypted orbital angular momentum multiplexed holography

Abstract

In this paper, we propose orbital angular momentum (OAM) multiplexing at different ellipticity channels using a computer-generated hologram for holographic encryption. By encoding information into elliptic vortex beams with different helical mode indices and ellipticities, the OAM selective holographic information can only be reconstructed by an incident elliptic optical vortex (EOV) with an inverse helical mode index under a specific ellipticity. Holograms for different EOVs and multichannel multiplexing are well designed. Experimental results agree well with the theoretical design and numerical simulations, verifying the feasibility of OAM multiplexing-based ellipticity encrypted holography. This method can further increase data storage and enhance information security in different holographic systems.