Abstract
We propose a new approach to generating unidirectional transmission of acoustic waves using transmitted and reflected acoustic metasurfaces (AMSs). Our research is supported by both theoretical arguments and simulations. Such an approach can realize unidirectional acoustic transmission in a certain frequency band. Transmission efficiency is maintained high owing to the impedance-matching condition while allowing other objects, both fluid and solid, to pass freely through the acoustic channel. The simulation results are in accordance with the theoretical predictions. Moreover, because of the simple geometric profile of these AMSs, the approach should be useful and easy to implement as an integral part of more complex technologies related to medical ultrasound and noise insulation.
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