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) Schematic diagram of the working principle of the asymmetric transmission system (ATS) for (a) positive direction (PD) case and (b) negative direction (ND) case.