Development and progress in acoustic phase-gradient metamaterials for wavefront modulation |
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Affiliation: | 1. Department of Materials Science and Engineering & Research Institute of Advanced Materials, Seoul National University, Seoul, Republic of Korea;2. Lawrence Livermore National Laboratory, Livermore, USA;1. Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, China;2. Laboratory of Applied Physics and Wave Engineering, School of Basic Education, Beijing Institute of Graphic Communication, 1 Xinghua Avenue (Band 2), Beijing, 102600, China;3. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China |
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Abstract: | Acoustic metamaterials (AMs) for sound wave manipulation have attracted significant attention due to their fascinating functionalities, such as anomalous reflection/refraction, acoustic cloaking, sound absorption, acoustic imaging, etc. The acoustic phase-gradient metamaterials possess the capability of wavefront manipulation, thus, are fundamental to designing these fascinating functionalities. The underlying mechanism is controlling the acoustic responses (the phase and/or amplitude) of the units by varying the parameters so that one can redirect the wavefront in the desired manner. In this article, we review the state-of-the-art on development of phase-gradient metamaterials for wavefront manipulation. The governing principles of the phase-gradient metamaterials for wave control in static and moving media are first introduced. Then, according to the unit type, the phase-gradient metamaterials are roughly classified into three categories: the locally resonant structures, the space-coiling structures and the material-filling structures. Afterwards, three representative functionalities of the gradient metamaterials are reviewed, including acoustic cloaking, sound absorption/isolation and acoustic lens. Finally, the limitations of present metamaterials and possible future directions for development are concluded. |
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Keywords: | Acoustic phase-gradient metamaterials Wavefront manipulation Review Applications |
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