Perspective: Acoustic metamaterials in transition
Perspective: Acoustic metamaterials in transition
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DOI：
10.1063/1.5007682
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发表时间：
2018-03
影响因子：
3.2
通讯作者：
Ying Wu;Min Yang;P. Sheng
中科院分区：
文献类型：
--
作者：
Ying Wu;Min Yang;P. Sheng
Acoustic metamaterials derive their novel characteristics from the interaction between acoustic waves with designed structures. Since its inception seventeen years ago, the field has been driven by fundamental geometric and physical principles that guide the structure design rules as well as provide the basis for wave functionalities. Recent examples include resonance-based acoustic metasurfaces that offer flexible control of acoustic wave propagation such as focusing and re-direction; parity-time (PT)-symmetric acoustics that utilizes the general concept of pairing loss and gain to achieve perfect absorption at a single frequency; and topological phononics that can provide one-way edge state propagation. However, such novel functionalities are not without constraints. Metasurface elements rely on resonances to enhance their coupling to the incident wave; hence, its functionality is limited to a narrow frequency band. Topological phononics is the result of the special lattice symmetry that must be fixed a...
