Breaking the limits of acoustic science: A review of acoustic metamaterials

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 305; p. 117384
• Main Authors: Aydın, Gülcan, San, Sait Eren
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2024
• Subjects: Acoustic control technology; Acoustic metamaterials; Acoustic wave manipulation; Negative Poisson's ratio; Negative refractive index; Noise reduction; Sound absorption; Sound waves; Acoustic wave manipulation; Sound waves; Negative Poisson's ratio; Noise reduction; Acoustic metamaterials; Negative refractive index; Acoustic control technology; Sound absorption
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2024.117384

•The unique characteristics of acoustic metamaterials (AMMs), which are not found in natural materials, have been explored.•The fundamental structures, application areas, opportunities, and challenges of AMMs have been examined in detail.•The importance of simulation in designing AMMs has been emphasized, and 3D printing has been examined for their fabrication.•It has been suggested that a materials-centered approach holds the potential for revolutionary developments in this field. Acoustic metamaterials (AMMs) are a form of man-made material that can be specifically developed to have a sub-wavelength periodic structure with extraordinary characteristics not found in nature. Recently, the ability to manipulate sound waves and elastic waves, thanks to these properties, has attracted great interest from scientists and engineers and has been the subject of intense research. This review presents general conceptual descriptions of these materials. We have summarized current literature and we investigated basic structures such as Helmholtz resonators, membrane-type structures, locally resonant and space-coiled structures, and application fields of acoustic metamaterials such as sound imaging, sound absorption, acoustical cloaking, noise reduction, and underwater acoustics. As simulation methods are essential for design and performance evaluation of acoustic metamaterials, the studies carried out in the literature were described and 3D printing technologies for the fabrication of these designs were investigated. Finally, we discuss the opportunities and challenges of acoustic metamaterials. While acoustic metamaterials have enormous ability for the field of sound control, AMMs also present challenges such as frequency-dependent operation, optimization requirements, and material costs. This review provides a comprehensive resource to guide researchers and engineers in understanding the importance and future potential of acoustic metamaterials and identifying gaps in the literature.