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) Circular pressure distributions at z = 20 cm generated by the coaxial AV beams with (a) and , and (b) and for the initial spatial angles of 0°, −30°, and −60°.