彩虹超材料中无序引起的带隙展宽
Bandgap widening by disorder in rainbow metamaterials
摘要：
短柱板，即，具有柱状谐振器的薄弹性片显示出亚波长的局部谐振带隙，其主要由柱的固有谐振特性控制。在这项工作中，我们实验研究的可调异质板赋予可重构家庭的支柱的带隙响应。我们证明，在某些情况下，柱的谐振频率的频谱和它们的空间布置影响系统的滤波特性。具体地，空间梯度和无序排列都导致带隙加宽。此外，平均而言，随机排列实现衰减的光谱范围比渐变配置观察到的光谱范围更宽。
英文摘要：
Stubbed plates, i.e., thin elastic sheets endowed with pillar-like resonators, display subwavelength, locally-resonant bandgaps that are primarily controlled by the intrinsic resonance properties of the pillars. In this work, we experimentally study the bandgap response of a tunable heterogeneous plate endowed with reconfigurable families of pillars. We demonstrate that, under certain circumstances, both the spectrum of resonant frequencies of the pillars and their spatial arrangement influence the filtering characteristics of the system. Specifically, both spatially graded and disordered arrangements result in bandgap widening. Moreover, the spectral range over which attenuation is achieved with random arrangements is on average wider than the one observed with graded configurations.
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