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) (a) Radial pressure distributions at z = 20 cm generated by the even- and odd-numbered AV with l = 1 to 7, and the corresponding radial pressure distributions generated by the coaxial AV beams with (b) and , and (c) and for different values of .