Papazoglou, Dimitris l_1=2_l_2=-2.avi Intensity and phase (x,y) cross-sectional images as a function of the propagation for a Tornado wave resulting from the superposition of two ring-Airy beams that carry OAM of topological charge +2,-2 respectively Physical Optics 2020-01-03
    https://opticapublishing.figshare.com/articles/media/l_1_2_l_2_-2_avi/9204575
10.6084/m9.figshare.9204575.v1