Controllable subwavelength topological rainbow trapping in water-filling acoustic metamaterials

Wang, Guifeng; Wei, Yuanting; Chen, Zhenyu; Lim, C.W.

doi:10.1016/j.apacoust.2023.109366

Cited by 14 publications

(2 citation statements)

References 57 publications

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“…According to what we know as much as possible, current studies of valley degeneracy states in topological rainbow trapping are mainly based on the Bragg theorem, which results in high frequencies for elastic topological rainbow trapping. Wang et al filled different heights of water in the honeycomb lattice, adjusting the frequency of the topological boundary state by controlling the column of water [45]. They realized the sub-wavelength topological rainbow capture of sound waves by negative bulk modulus (>1 kHz).…”

Section: Introductionmentioning

confidence: 99%

Sub-wavelength topological boundary states and rainbow trapping of local-resonance phononic crystal plate

Sun,

Tan,

et al. 2024

J. Phys. D: Appl. Phys.

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Based on the analogy of the quantum valley Hall effect, a ligament-type phononic crystal plate with local resonators is designed in this study to facilitate the valley state transport of low-frequency elastic waves. We analyze the key factors affecting the local resonance modes and reduce the frequency of the Dirac cone by changing the connection form of the structure's beams. The spatial inversion symmetry of the structure is broken to open a new band gap by introducing a mass difference in the resonator pair. The robustness of the designed structure's topological valley waveguide under defects and bends is verified. Based on this characteristic, we introduce the gradient heights into the supercell structure where elastic waves at different frequencies split and stop significantly on the supercell structure to achieve sub-wavelength topological rainbow trapping. This design provides a theoretical reference for exploring the low-frequency elastic topological mode and the application of topological rainbow capture in sub-wavelength structures.

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Section: Introductionmentioning

confidence: 99%

Sub-wavelength topological boundary states and rainbow trapping of local-resonance phononic crystal plate

Sun,

Tan,

et al. 2024

J. Phys. D: Appl. Phys.

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“…This undoubtedly opens new ideas for designing devices with lossless energy transmission and high fault tolerance. Recent research on electronic systems has stimulated the study of topological insulators in acoustic systems [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. Because the symmetry of artificial crystals facilitates flexible clipping, the acoustic Quantum Valley Hall effect (AVH) [47] has received increasing attention [48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Stepless space-regulation of topological acoustic controller with high fault tolerance

Ma,

Wu,

Liu

et al. 2024

J. Phys. D: Appl. Phys.

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In this paper, the stepless space-regulation of topological acoustic transmission channels with high fault tolerance is proposed through introducing structural defect dislocations into a topological acoustic controller. Due to the stability of topological order against local disturbance, the acoustic wave transmission is immune to dislocation boundaries with strong stability, and thus the topological acoustic controller has high fault tolerance. By continuous changing the dislocation, the position relationship between the outgoing and incident acoustic signals no longer limited to the integer multiple distance related to the lattice size, and can realize the efficient acoustic energy transmission without energy loss at the fractional multiple distance, that is, the topological controller can realize lossless sound energy transmission and reception in arbitrary position relationship. Furthermore, the coupling relationship between the defect dislocation and the topological acoustic channel is explored, which can realize the stepless space-regulation of the lossless channel in the wide band range. In addition, by further introducing multi-layer continuous dislocations, this high-fault-tolerant topological acoustic controller still has strong stability, and multiple error factors do not affect the transmission results, which greatly reduces the difficulty of manufacturing. Finally, the stepless space-regulation of topological acoustic channels and the high-fault-tolerant topological acoustic controller that are easy to manufacture are verified by our experiments. This research paves the way for the engineering applications of acoustic micro-control, micro-nano fabrication, remote acoustic energy transmission manipulation, acoustic measurement, weak signal processing, acoustic flexible control and other micro-shape and multi-functional acoustic devices, and will bring more inspiration to other classical wave communication fields such as light wave, electromagnetic wave and so on.

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Acoustic Metamaterial Sensing System for Bearing Fault Detection in Rotate Vector Reducers

Huang,

Lin,

Tang

et al. 2024

Mechanisms and Machine Science

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Controllable subwavelength topological rainbow trapping in water-filling acoustic metamaterials

Cited by 14 publications

References 57 publications

Sub-wavelength topological boundary states and rainbow trapping of local-resonance phononic crystal plate

Sub-wavelength topological boundary states and rainbow trapping of local-resonance phononic crystal plate

Stepless space-regulation of topological acoustic controller with high fault tolerance

Acoustic Metamaterial Sensing System for Bearing Fault Detection in Rotate Vector Reducers

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