We reveal a unique effect in which the ultrasonic transmission efficiency from the air to the liquid is significantly enhanced by the liquid surface concavity induced by ultrasound. The surface concavity acts as a special geometry-controllable transducer to transmit ultrasound into the liquid, where the sound transmission efficiency exhibits a relationship with the concavity depth: τ ∼ d2.
X. Tang, L. Zhang, Z. Hou, M. Zhou, Y. Jiang and D. Zang, Soft Matter, 2026, Advance Article , DOI: 10.1039/D5SM01236H
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