Abstract
Acoustic metamaterials are materials with artificially designed structures, which have characteristics that surpass the behavior of natural materials, such as negative refraction, anomalous Doppler effect, plane focusing, etc. This article mainly introduces and summarizes the related research progress of acoustic metamaterials in the past two decades, focusing on meta-atomic acoustic metamaterials, metamolecular acoustic metamaterials, meta-atomic clusters and metamolecule cluster acoustic metamaterials. Finally, the research overview and development trend of acoustic metasurfaces are briefly introduced.
Highlights
Waves are a ubiquitous form of motion in nature, and the research on wave regulation has a wide range of applications, and greatly promotes the development of science and technology
Acoustic metamaterials (AM) and phononic crystals have attracted the attention of researchers, and great progress has been made in engineering applications
Chen et al [50,51,52,53] presented the combination of a hollow tube (HT) structure with negative mass density and an open hollow sphere structure with negative elastic modulus which can realize double-negative acoustic metamaterials, and at the same time, the two structures can be coupled into a metamolecule to achieve double-negative AM
Summary
Waves are a ubiquitous form of motion in nature, and the research on wave regulation (including wave propagation direction and physical properties, etc.) has a wide range of applications, and greatly promotes the development of science and technology. Similar to the research method of electromagnetic metamaterials [2,3,4,11,12], The focus was on how to achieve negative mass density elastic modulus, double-negative AM, and many theoretically models were proposed [13,14,15]. Ding et al [39,40,41,42,43,44] proposed an open hollow sphere, where the structure realizes the negative equivalent elastic modulus in the air medium.
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