Bidirectional asymmetric acoustic focusing with two flat acoustic metasurfaces<xref rid="cpb_27_12_124302fn1" ref-type="fn">*</xref><fn id="cpb_27_12_124302fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11704193, 11674175, and 11704192), the “333” Project of Jiangsu Province, China (Grant No. BRA2017451), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX18

Bidirectional asymmetric acoustic focusing with two flat acoustic metasurfaces**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11704193, 11674175, and 11704192), the “333” Project of Jiangsu Province, China (Grant No. BRA2017451), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX18_1185).

Chen Di-Chao, Zhu Xing-Feng^†, Wei Qi, Wu Da-Jian^‡

(color online) (a) Spatial phase profile in y-axis direction for two parabolic trajectories [y = −0.8x^1/2 (y ≤ 0) and y = 0.8x^1/2 (y ≥ 0)] (PT-2) and (b) acoustic field distribution of PT-2 through AM-2. Scattered dots in panel (a) represent discrete phases of 80 subunits (one dot corresponds to one subunit).