Petal orbital angular momentum multiplexing holography for two-dimensional optical encryption

Orbital angular momentum (OAM) multiplexing holography offers unprecedented capacity for optical encryption. We propose a petal OAM holographic scheme for two-dimensional optical encryption by constructing superposition modes of ±<i>ℓ</i> OAM states with phase <i>φ</i>, uniquely encoding dual degrees of freedom (DoFs, <i>ℓ</i> and <i>φ</i>) as independent multiplexing channels. The strong mode selectivity enables multi-image integration into a single hologram, doubling information capacity while enhancing security. Simulations and experiments validate petal OAM's preservation, selective addressing, and multiplexing capability. A 2D high-security encryption platform is experimentally demonstrated, providing an anti-counterfeiting solution with multi-parameter optical encryption. This work pioneers OAM DoF synergy for next-generation holographic security systems.