Broadband acoustic focusing by symmetric Airy beams with phased arrays comprised of different numbers of cavity structures
Qian Jiao1, Liu Bo-Yang1, Sun Hong-Xiang1, 2, †, Yuan Shou-Qi1, ‡, Yu Xiao-Zhu1
       

(color online) Distributions of acoustic intensity through focus along lines (a) I and (b) II in Fig. 4.