Homogeneous Dislocation-Induced Rainbow Concentrating for Elastic Waves

作者：Zidong Zhang, Shili Yang, Shiling Yan, Si‐Yuan Yu, Ming‐Hui Lu, Yan-Feng Chen · 发表于：Physical Review Applied · 年份：2022 · DOI：10.1103/physrevapplied.18.044015 · 被引用次数：12 · 研究领域：Acoustic Wave Phenomena Research、Metamaterials and Metasurfaces Applications、Speech and Audio Processing

Defects play a crucial role in the physical properties of crystals, whether for classical or quantum systems. For example, in photonic and phononic crystals, defects can serve as precise guidance for and localization of classical electromagnetic or mechanical waves. Rainbow concentrating, an exotic wave localization, exploits defects to enable the collection and frequency routing of weak signals in real space. Here, using a solid-state phononic crystal (PnC) plate, we experimentally verify this phenomenon by deliberately infusing a homogeneously graded dislocation, i.e., a line defect, into the PnC. Two PnCs separated by the defect will breed deterministic interface states along with the defect, offering rainbow trapping and concentrating for elastic waves. Our PnC-based rainbow trappers and concentrators are scalable and configurable, and thus, are promising for advancing applications like energy harvesting, information processing, and acoustofluidic manipulation.