LAUSR

Acoustic metamaterials have been utilized in recent years to demonstrate extreme acoustic properties, such as those with negative or near-zero dynamic values. While effective, the use of acoustic metamaterials can lead to voluminous structures that may not be practical for some applications. Alternatively, ultrathin structures known as acoustic metasurfaces offer the same capability to achieve extreme properties as acoustic metamaterials while offering the added benefit of having negligibly small (i.e., subwavelength) thickness. In this work, we will discuss an aqueous acoustic metasurface that utilizes subwavelength structures designed to acoustically act in parallel, allowing for a thin, modular structure to be realized while achieving a broad range of effective surface properties. A theoretical formulation for the design of the flexural elements is presented, accounting for the elastic motion of the elements subject to fluid loading due to the water. Based on this design, an aqueous acoustic metasurfac...