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) Acoustic field distribution of the ATS for PD case. (b) Intensity contrasts |p/p₀|² on dotted line “I” in panel (a). (c) Intensity contrast |p/p₀|² on dotted line “II” in panel (a)]. (d) Acoustic field distribution of the ATS for the ND case. (e) Intensity contrasts |p/p₀|² on dotted line “I” in panel (d). (f) Intensity contrasts |p/p₀|² on dotted line “II” in panel (d)]. The working frequency is fixed at 3.432 kHz and the space L between two AMs is fixed at 8.5λ₀.