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 with obvious edge phase dislocations generated by the coaxial AV beams with ((a) and (b)) lE = 3 and lO = −3, and ((c) and (d)) lE = 5 and lO = −5 for Δφ = π/16.