Multiple off-axis acoustic vortices generated by dual coaxial vortex beams
Li Wen1, Dai Si-Jie2, Ma Qing-Yu1, †, Guo Ge-Pu1, Ding He-Ping1
       

(color online) Cross-sectional distributions of pressure and phase at z = 20 cm generated by the coaxial AV beams with ((a) and (b)) , ((c) and (d)) , and ((e) and (f)) superimposed multiple off-axis AVs.