Acoustic Wave Control via Symmetry Modulation in Metamaterials inspired by Tesla Valves

Acoustic metamaterials, known for their ability to manipulate wave propagation, have applications in noise reduction, acoustic holography, and acoustic cloaking, among others. In this context, Tesla valves are passive structures originally designed to control fluid flow, functioning analogously to a diode in electrical systems. However, their potential in acoustic wave control remains largely unexplored. This study demonstrates the relevance of symmetry in the unit cell geometry for the acoustic behavior of Tesla valves. Using an approach that integrates numerical and experimental analysis, we examine the emergence and modification of band gaps in arrays of these structures. A dispersion analysis of unit cells in various configurations reveals how symmetry variations significantly influence band gap formation. Finite element simulations predict the acoustic response, and designed prototypes, along with experimental measurements, validate these findings. These results highlight the potential of Tesla valves as frequency-tunable acoustic elements, opening new perspectives in waveguiding, filtering, and acoustic waves control.