Spectral flow of a localized mode in elastic media
Spectral flow of a localized mode in elastic media
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DOI：
10.1103/physrevapplied.20.064018
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发表时间：
2021-11
影响因子：
4.6
通讯作者：
M. Miniaci;F. Allein;R. Pal
中科院分区：
文献类型：
--
作者：
M. Miniaci;F. Allein;R. Pal
众所周知，在其他周期性介质中引入结构缺陷，可以在包括弹性在内的各种物理领域中实现特殊的空间控制和波的局部化。尽管到目前为止提出了各种各样的设计，但大多数方法都来自于上下文修改，由于缺乏通用理论，这些方法无法转化为设计范式。少数例外包括具有拓扑色散带的设计，然而，这需要改变结构的大部分。为了克服这些局限性，在这里，我们引入了一个新的理论基础上的实空间拓扑结构，实现连续弹性介质中的本地化模式。我们从理论上预测和实验上证明了一个本地化模式的频谱流通过调制一个单一的结构参数在任何选定的位置在结构中的整体频率间隙。这种方法的简单性和通用性为设计用于能量定位和控制的基于波的设备开辟了新的途径。
The introduction of structural defects in otherwise periodic media is well known to grant exceptional space control and localization of waves in various physical fields, including elasticity. Despite the variety of designs proposed so far, most of the approaches derive from contextual modifications that do not translate into a design paradigm due to the lack of a general theory. Few exceptions include designs endowed with topological dispersion bands, which, however, require changes over substantial portions of the structure. To overcome these limitations, here we introduce a new rationale based on real-space topology to achieve localized modes in continuous elastic media. We theoretically predict and experimentally demonstrate the spectral flow of a localized mode across a bulk frequency gap by modulating a single structural parameter at any chosen location in the structure. The simplicity and generality of this approach opens new avenues in designing wave-based devices for energy localization and control.