Multiband topologically protected states realized by elastic honeycomb structures based on fundamental mechanical elements

He, Liu

doi:10.1016/j.euromechsol.2022.104803

Cited by 3 publications

(1 citation statement)

References 72 publications

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“…Despite numerous theoretical studies, [35][36][37][38][39][40] there is very little experimental evidence of elastic wave control in 3D topological metamaterials, [34] due to the challenges associated with the fabrication and testing of intricate 3D mechanical architectures. Furthermore, despite previous studies demonstrating multiband operation in 2D topological metamaterials, [41][42][43][44][45][46] the 3D topological metamaterials established thus far are constrained to function in a single frequency band. This single-band characteristic limits the working bandwidth and information-carrying capacity of 3D topological metamaterials, reducing their suitability for multiband wave-based applications such as lasers, [47] filters, [48] resonators, [49] on-chip circuits, [50] isolators, [51,52] and wireless networks.…”

Section: Introductionmentioning

confidence: 99%

Uncovering and Experimental Realization of Multimodal 3D Topological Metamaterials for Low‐Frequency and Multiband Elastic Wave Control

Dorin,

Khan,

Wang

2023

Advanced Science

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Topological mechanical metamaterials unlock confined and robust elastic wave control. Recent breakthroughs have precipitated the development of 3D topological metamaterials, which facilitate extraordinary wave manipulation along 2D planar and layer‐dependent waveguides. The 3D topological metamaterials studied thus far are constrained to function in single‐frequency bandwidths that are typically in a high‐frequency regime, and a comprehensive experimental investigation remains elusive. In this paper, these research gaps are addressed and the state of the art is advanced through the synthesis and experimental realization of a 3D topological metamaterial that exploits multimodal local resonance to enable low‐frequency elastic wave control over multiple distinct frequency bands. The proposed metamaterial is geometrically configured to create multimodal local resonators whose frequency characteristics govern the emergence of four unique low‐frequency topological states. Numerical simulations uncover how these topological states can be employed to achieve polarization‐, frequency‐, and layer‐dependent wave manipulation in 3D structures. An experimental study results in the attainment of complete wave fields that illustrate 2D topological waveguides and multi‐polarized wave control in a physical testbed. The outcomes from this work provide insight that will aid future research on 3D topological mechanical metamaterials and reveal the applicability of the proposed metamaterial for wave control applications.

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