Coherent control of double-ring perfect optical vortex via hyper-Raman scattering in a Landau-quantized graphene

A scheme for the control of double-ring perfect optical vortex (DR-POV) in a Landau-quantized graphene is proposed. The orbital angular momentum is transferred from a unique DR-POV mode to the generated Raman field via hyper-Raman scattering process. Using experimentally achievable parameters, we identify the condition under which the probe detuning allows us to improve the output intensity and quality of the vortex Raman field and engineer the helical phase wavefront. Furthermore, we find that the intensity and phase patterns of the vortex Raman field can be effectively controlled via adjusting the intensity of the control field. Subsequently, we perform the superposition mode created by the coaxial interference between the generated vortex Raman field and a same frequency DR-POV beam and show interesting optical properties. Our scheme may have potential applications in high-capacity optical communication and optical information process based on POV in 2D material.