TY - Chin. Phys. Lett. A1 - Han Zhang, Yang Gao T1 - Acoustic Vortex Beam Generation by a Piezoelectric Transducer Using Spiral Electrodes Y1 - 2019-10-15 JF - Chinese Physics Letters JO - Chin. Phys. Lett. SP - 114302EP - VL - 36 IS - 11 UR - https://cpl.iphy.ac.cn N1 - 10.1088/0256-307X/36/11/114302 ER -