极性超材料：隐身应用共振的新前景
Polar metamaterials: A new outlook on resonance for cloaking applications
摘要：
利用旋转共振超材料来回答一个长期存在的问题，关于存在的transformation-invariant弹性材料和ad-hoc的transformationbased被动隐身在全平面弹性动力学的可能性。与定制的晶格几何形状相结合，发现旋转共振诱导极性和手性行为，这是一个行为缺乏应力和镜像对称性，分别。其核心而简单的思想是，一群旋转共振器可以施加一定密度的体转矩，其强度足以改变角动量的平衡，而角动量的平衡正是这些对称性的基础。所获得的极性超材料被用作隐身装置的构建块。数值试验表明，在压力和剪切探测波下，通过自由边界进一步耦合，隐身性能令人满意。这项工作揭示了新的光在超材料的共振现象，并应有助于把平等的基础上变换弹性动力学与变换声学和光学。
英文摘要：
Rotationally resonant metamaterials are leveraged to answer a longstanding question regarding the existence of transformation-invariant elastic materials and the ad-hoc possibility of transformationbased passive cloaking in full plane elastodynamics. Combined with tailored lattice geometries, rotational resonance is found to induce a polar and chiral behavior; that is a behavior lacking stress and mirror symmetries, respectively. The central, and simple, idea is that a population of rotating resonators can exert a density of body torques strong enough to modify the balance of angular momentum on which hang these symmetries. The obtained polar metamaterials are used as building blocks of a cloaking device. Numerical tests show satisfactory cloaking performance under pressure and shear probing waves, further coupled through a free boundary. The work sheds new light on the phenomenon of resonance in metamaterials and should help put transformation elastodynamics on equal footing with transformation acoustics and optics.
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