Multiparameter multiplexing applied in an OAM holography via moiré metalens phase encoding

Orbital angular momentum(OAM) holography has attracted wide attention from researchers in high-security encryption field. In this manuscript, the moiré phase modulation is introduced in multiplexing holography to achieve information encryption. The modulated parameters of the moiré metalens phase(MMP) plate, namely the topological charge (TC) number, the moiré constant, the azimuthal displacement factor, the segment modes and the displacement amount on the structure of the moiré phase plate can be used as encoding and decoding keys in OAM holography. The feasibility of the proposed scheme with the above parameters is verified by numerical simulations and experiments. The advantage is that this technique is of higher design freedom and security compared to the existed orbital angular momentum multiplexed holography techniques. The flexibility of the MMP plate promotes the encrypted channel diversity and shows a new perspective.