In situ steering of shear horizontal waves in a plate by a tunable electromechanical resonant elastic metasurface

A multifunctional electromechanical coupling metasurface is proposed to steer elastic shear horizontal (SH) waves. The horizontal shear deformation of the metasurface is coupled with a shunting circuit by in-plane polarized piezoelectric patches. A prospective phase distribution along the metasurface can be achieved by adjusting the negative capacitances of the shunting circuit to change the electromechanical resonant response. Multiple functions are demonstrated, including wave focusing and anomalous refraction of plane waves in different frequencies. In addition, an asymmetric wave transmission is produced by designing a dual-layer metasurface. Results show that this metasurface opens up a way toward advanced electromechanical coupling and tunable manipulation of elastic SH waves.