Electroelastic metasurface with resonant piezoelectric shunts for tunable wavefront control

TL;DR

This paper introduces a tunable electroelastic metasurface with resonant piezoelectric shunts that enables dynamic control of wavefronts, including deflection and focusing of Lamb waves, through adjustable electric loads.

Contribution

It develops a coupled electromechanical model and demonstrates tunable wavefront manipulation using resonant shunt circuits on piezoelectric patches.

Findings

Achieved wave deflection at various angles.

Enabled wave focusing at different focal points.

Validated through numerical and experimental results.

Abstract

This study presents a tunable phase-modulated metasurface composed of periodically distributed piezoelectric patches with resonant-type shunt circuits. The fully coupled electromechanical model is established to study the transmission characteristics of the metasurface unit and validated through numerical and experimental studies. Based on the analysis of the metasurface unit, we first explore the performance of electroelastic metasurface with single-resonant shunts and then extend its capability with multi-resonant shunts. By only tuning the electric loads in the shunt circuits, we utilize the proposed metasurface to accomplish wave deflection and wave focusing of A0 mode Lamb waves at different angles and focal points, respectively.