Bidirectional asymmetric acoustic focusing with two flat acoustic metasurfaces
Di-Chao Chen(陈帝超), Xing-Feng Zhu(朱兴凤), Qi Wei(魏琦), Da-Jian Wu(吴大建)
Chin. Phys. B . 2018, (12): 124302 -124302 .  DOI: 10.1088/1674-1056/27/12/124302