Energy reconfigurable meta-resonant-cavity to generate asymmetry vortex beam in microwave

In this paper, a method for reconfiguring the energy distribution of vortex beam carrying orbital angular momentum (OAM) mode is proposed and verified in microwave region, which is achieved through ultra-thin meta-lens with resonant cavity structure. The spatial phase distribution of OAM mode is imposed by P-B phase principle, and the vortex wave front is performed in the cross-polarized transmission field wave. The reconfigurable energy intensity of vortex beam is achieved by two unit cells with distinguishable amplitude levels. The independent manipulation of amplitude and phase of vortex beam carrying OAM mode could be achieved by mean of changing the phase differences of co-polarization between two linear polarization waves. The mappings of electric field and phase distribution are in good agreement with theoretic design processes. This proposed meta-surface could be applied in the specially required energy tunable ultra-thin lens, nano-projectors, reconfigurable beam sheering devices, energy selective devices or ultrathin microwave components for imaging and sensing technologies in the wireless medium-short-wave distance communication.