Zega Valentina, Silva Priscilla B, Geers Marc G D, Kouznetsova Varvara G
Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.
Sci Rep. 2020 Jul 21;10(1):12041. doi: 10.1038/s41598-020-68894-3.
High-performance locally resonant metamaterials represent the next frontier in materials technology due to their extraordinary properties obtained through materials design, enabling a variety of potential applications. The most exceptional feature of locally resonant metamaterials is the subwavelength size of their unit cells, which allows to overcome the limits in wave focusing, imaging and sound/vibration isolation. To respond to the fast evolution of these artificial materials and the increasing need for advanced and exceptional properties, the emergence of a new mechanism for wave mitigation and control consisting in a nonlinear interaction between propagating and evanescent waves has recently been theoretically demonstrated. Here, we present the experimental proof of this phenomenon: the appearance of a subharmonic transmission attenuation zone due to energy exchange induced by autoparametric resonance. These results pave the path to a new generation of nonlinear locally resonant metamaterials.
高性能局部共振超材料因其通过材料设计获得的非凡特性而代表了材料技术的下一个前沿领域，能够实现各种潜在应用。局部共振超材料最突出的特点是其单元胞的亚波长尺寸，这使得能够克服波聚焦、成像和声/振动隔离方面的限制。为了应对这些人造材料的快速发展以及对先进和卓越性能日益增长的需求，最近在理论上证明了一种由传播波和倏逝波之间的非线性相互作用组成的波缓解和控制新机制的出现。在此，我们展示了这一现象的实验证据：由于自参量共振引起的能量交换而出现的亚谐波传输衰减区。这些结果为新一代非线性局部共振超材料铺平了道路。
