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) Spatial distributions of acoustic intensity field induced by acoustic lens at (a) 7.6 kHz, (b) 8.3 kHz, (c) 8.65 kHz, and (d) 9.0 kHz.