Orbital Angular Momentum Multiplexing Holography Based on Radial Phase Encoding

Orbital angular momentum (OAM) holography gradually develops towards multi-dimension, large capacity, multi-degree of freedom and high complexity. Benefiting from the light field modulation mechanism in the radial space, a radially sub-region modulated OAM multiplexing holography is proposed to increase information capacity by using different diameters of radial annuluses (RA) or different radial gradient (RG) factors of vortex phase plate. The required image can be reconstructed by using corresponding inverse modulated phase distribution. Fully used the radial space increases the information capacity of OAM holography. Meanwhile, two proposed keys, namely the annulus radius and the radial topological charge gradient, enhance the encryption security of traditional OAM holography. The proposed method is able to combine with existed OAM holography for achieving complete full bandwidth multiplexing, which opens a new window for increasing the capacity of the information storage and communication.