Abstract
Acoustic metamaterials refer to artificial structures or composites, composed of identical or gradually changing elaborately designed cell arrays, which can manipulate sound waves within subwavelength scales. Through carefully designing the microstructure and dimension parameters of acoustic metamaterial cells, the two key physical parameters that are essential for the propagation of the sound wave in materials—effective density ρ and bulk modulus K—can be regulated in a large range, even to negative. Those characteristics can generate varieties of extraordinary properties such as low-frequency bandgap, negative index, acoustic cloaks, etc. This chapter introduces adaptable ultra-thin low-frequency sound absorption metamaterials, and multiphase pentamode water-like metamaterials.
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