Broad-band acoustic hyperbolic metamaterial

TL;DR

This paper presents the design and experimental validation of a broadband acoustic hyperbolic metamaterial operating between 1.0 kHz and 2.5 kHz, enabling advanced control over acoustic wave propagation.

Contribution

It introduces the first broadband acoustic hyperbolic metamaterial with experimental demonstration, expanding the potential applications in acoustic wave manipulation.

Findings

Operates effectively between 1.0 kHz and 2.5 kHz

Demonstrates hyperbolic dispersion characteristics

Enables advanced acoustic wave control

Abstract

Acoustic metamaterials (AMMs) are engineered materials, made from subwavelength structures, that exhibit useful or unusual constitutive properties. There has been intense research interest in AMMs since its first realization in 2000 by Liu et al. A number of functionalities and applications have been proposed and achieved using AMMs. Hyperbolic metamaterials are one of the most important types of metamaterials due to their extreme anisotropy and numerous possible applications, including negative refraction, backward waves, spatial filtering, and subwavelength imaging. Although the importance of acoustic hyperbolic metamaterials (AHMMs) as a tool for achieving full control of acoustic waves is substantial, the realization of a broad-band and truly hyperbolic AMM has not been reported so far. Here, we demonstrate the design and experimental characterization of a broadband AHMM that operates between 1.0 kHz and 2.5 kHz.