Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review
Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review
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DOI：
10.1002/adfm.202206309
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发表时间：
2022-07
影响因子：
19
通讯作者：
M. Oudich;N. J. Gerard;Yuanchen Deng;Yun Jing
中科院分区：
文献类型：
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作者：
M. Oudich;N. J. Gerard;Yuanchen Deng;Yun Jing
在固态物理学中，带隙（BG）是指不存在电子态的能量范围。这个概念被扩展到经典波，产生了光子和声子晶体的整个领域，其中 BG 是禁止波传播的频率（或波长）间隔。对于弹性波，BG 具有周期性交替的机械特性（即刚度和密度）。这催生了声子晶体和后来的弹性超材料，为广泛的应用提供了前所未有的功能。平面超材料是为振动屏蔽而构建的，而大量的工作重点是将声子晶体集成到微系统中，以实现光机械系统中的滤波、波导和动态应变能限制。此外，过去十年见证了拓扑绝缘体的兴起，这导致了拓扑绝缘体的弹性动力学类似物的创建，用于稳健地操纵机械波。同时，增材制造使得 3D 架构的弹性超材料得以实现，从而扩展了其功能。本综述旨在全面描述弹性超材料和声子晶体的丰富物理背景和最先进的技术，这些材料具有用于不同功能和应用的工程BG，并为这些人造材料的未来方向提供路线图。
In solid state physics, a bandgap (BG) refers to a range of energies where no electronic states can exist. This concept was extended to classical waves, spawning the entire fields of photonic and phononic crystals where BGs are frequency (or wavelength) intervals where wave propagation is prohibited. For elastic waves, BGs are found in periodically alternating mechanical properties (i.e., stiffness and density). This gives birth to phononic crystals and later elastic metamaterials that have enabled unprecedented functionalities for a wide range of applications. Planar metamaterials are built for vibration shielding, while a myriad of works focus on integrating phononic crystals in microsystems for filtering, waveguiding, and dynamical strain energy confinement in optomechanical systems. Furthermore, the past decade has witnessed the rise of topological insulators, which leads to the creation of elastodynamic analogs of topological insulators for robust manipulation of mechanical waves. Meanwhile, additive manufacturing has enabled the realization of 3D architected elastic metamaterials, which extends their functionalities. This review aims to comprehensively delineate the rich physical background and the state‐of‐the art in elastic metamaterials and phononic crystals that possess engineered BGs for different functionalities and applications, and to provide a roadmap for future directions of these manmade materials.