Controlling an acoustic wave with a cylindrically-symmetric gradient-index system*
Zhang Zhea),b), Li Rui-Qia), Liang Bina),c), Zou Xin-Yea), Cheng Jian-Chuna),b)†
       
Simulated pressure field maps for the incident wave in which a plane wave with frequency f 2 = 1 × 105 Hz is considered, with α being −1 (a), 1 (b), 2 (c), and 3 (d).