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Ultrabroad acoustical limiting in nonlinear metamaterials due to adaptive-broadening band-gap effect

机译：自适应超宽能隙效应在非线性超材料中的超宽声学极限

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摘要

Nonlinear wave limiters transmit low-amplitude waves while blocking high-intensity ones for efficient target protection. However, the acoustical limiting effect in nonlinear materials remains hitherto unaddressed. In addition, tunable bandgap fosters advanced functions for devices, but it is still mostly regarded as a spatial and temporal invariant feature. In recent years, nonlinear acoustic metamaterials (NAM) have shown extraordinary properties for manipulating elastic waves. Here we achieve an enhanced nonlinear interaction in a different NAM. We theoretically and experimentally demonstrate that the NAM features an efficient acoustical limiting, and the limiting bandwidth adaptively broadens as the propagation distance/time increases. Within a short propagation distance, an ultrabroad limiting band is formed that overcomes the limitation of linear resonant bandgaps. It is clarified that the space-amplitude-dependent bandgap dominates the amplitude reduction, and the transient chaotic responses initialize the adaptive-broadening process. Our study highlights wave physics that could not obviously be realized in nonlinear optics. The self-adaptive band structures open up opportunities to realize exotic adaptive elements.
机译：非线性限幅器在传输低振幅波的同时阻止高强度波，以实现有效的目标保护。但是，迄今为止，非线性材料中的声学限制效果仍未得到解决。此外，可调带隙促进了设备的高级功能，但仍被大多数人视为时空不变的特征。近年来，非线性声学超材料（NAM）在操纵弹性波方面显示出非凡的性能。在这里，我们在不同的NAM中实现了增强的非线性相互作用。我们在理论上和实验上证明NAM具有有效的声学限制，并且随着传播距离/时间的增加，限制带宽会自适应地变宽。在较短的传播距离内​​，形成了一个超宽限制带，它克服了线性谐振带隙的限制。可以看出，依赖于空间振幅的带隙主导了振幅的减小，而瞬态混沌响应则开始了自适应扩展过程。我们的研究突出了在非线性光学中显然无法实现的波物理学。自适应带结构为实现奇异的自适应元素打开了机会。

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  • 来源
    《Physical review》 |2020年第10期|104304.1-104304.10|共10页
  • 作者

    Xin Fang; Jihong Wen; Henri Benisty; Dianlong Yu;

  • 作者单位

    Laboratory of Science and Technology on Integrated Logistics Support College of Intelligent Science and Technology National University of Defense Technology Changsha Hunan 410073 China;

    Universite Paris-Saclay Institut d'Optique Graduate School CNRS Laboratoire Charles Fabry 91127 Palaiseau France;

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