Acoustic edge mode in spiral-based metamaterials at subwavelength scale

Yang, Tao; Xiao, Boya; Yan, Feng; Dongliang, Pei; Yu, Li; Chen, Meng; Jiang, Heng; Zhang, Zheng; Wang, Yuren

doi:10.1016/j.rinp.2022.106008

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…This makes the volume occupied by the original 2D ATIs for the 3D space more demanding. Other researchers have introduced Helmholtz resonators or central resonant cavity structures in acoustic systems [30]. However, the frequency of the subwavelength Dirac cone formed by this structure is more than 2000 Hz at a lattice constant of 50 mm, which is obviously not low enough for acoustic waves in this way.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency acoustic edge modes based on a triangular maze

Liang,

Luo,

Chu

et al. 2024

Phys. Scr.

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For several years, acoustic topological insulators have received attention due to their unique ability to manipulate acoustic waves. However, acoustic wave manipulation due to acoustic topological insulators is based on Bragg scattering. This results in the wavelength being bounded by the lattice constant. In this paper, a new ultra-low frequency acoustic topological insulator structure is proposed using the labyrinth model in acoustic metamaterials. With a lattice constant of a0 = 60 mm, the unidirectional transmission frequency possessing a topologically protected edge state can be reduced to 684 Hz. This frequency is much lower than that of other structures with equal lattice constants. The length of the resonant cavity can be greatly increased by utilizing a triangular labyrinth structure at the symmetric position. Subwavelength Dirac cones can be constructed in the energy band structure by utilizing the local resonance effect. Topological phase transitions characterized by opposite valley Chern numbers can be achieved by changing the rotation angle of the scatterer. The results of simulations and numerical calculations verify the existence of a topology-protected unidirectional transmission edge state on topological boundaries. The properties of this edge state remains extremely robust in the presence of defects such as misordering, cavities, and corners. The research in this paper provides a efficient structure for controlling low-frequency acoustic waves.

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Section: Introductionmentioning

confidence: 99%

Low-frequency acoustic edge modes based on a triangular maze

Liang,

Luo,

Chu

et al. 2024

Phys. Scr.

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“…Some researchers have broken this limitation by constructing multiple bands [21][22][23]. Other researchers have refined the system with different acoustic topologies for different frequency band ranges [26][27][28][29][30][31][32]. Another effective solution is to achieve the controllability of bands [25].…”

Section: Introductionmentioning

confidence: 99%

Low-frequency broadband valley transport for acoustic topology based on extended resonance

Liang,

Luo,

Chu

et al. 2024

Phys. Scr.

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In view of the fact that the operating bandwidth of the current acoustic topology is not low enough and the bandgap width is narrow at low frequencies, an extended resonance method is proposed. It is possible to have a bandgap width of 100 Hz while lowering the operating band to 350 Hz. And the operating band can be reconfigured with the controllability of the structure. This work will make a significant contribution to low-frequency broadband as well as subwavelength band regulation.

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“…Consequently, to realize defect-immune rainbow trapping with highly localized wave energy, some researchers have proposed the possibility of hybridizing conventional gradient rainbow and topologically protected states [20,21]. Topological AMs [22][23][24], which originated from an analogous concept in condensed matter physics [25], have demonstrated their capability in energy localization due to the presence of topologically protected modes at interfaces. Being immune to backscattering, imperfections, sharp corners, and local defects, topological AMs are robust with high energy concentration [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

New topological rainbow trapping approach for phononic beam-foundation systems

Wang

Guan

Chen

et al. 2023

J. Phys. D: Appl. Phys.

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Rainbow trapping is of great significance for frequency-based wave splitting and broadband wave attenuation. By recognizing the deficiency of prevailing gradient rainbow reflection device in terms of energy concentration and broadband vibration isolation, we design a new topological rainbow trapping device by introducing topological protected interface mode into the prevailing gradient rainbow device. Therefore, a topological rainbow trapping beam composed of a homogenous beam rested on an alternate and gradient foundation is constructed. Using theoretical and numerical analysis, we perform a unit-cell band structure analysis. The dependence of bandgap region and group velocity on reference foundation stiffness is investigated. With the help of topological phase transition and Zak phase analysis, we successfully predict and demonstrate topological protected interface mode. A quantitative evaluation of the advancement of topological rainbow devices upon the prevailing gradient device in vibration amplification and broadband wave attenuation is also presented. We believe the robust one-dimensional topological rainbow trapping beam will be useful in many applications such as energy harvesting, wave splitting, and vibration control.

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Acoustic edge mode in spiral-based metamaterials at subwavelength scale

Cited by 10 publications

References 33 publications

Low-frequency acoustic edge modes based on a triangular maze

Low-frequency acoustic edge modes based on a triangular maze

Low-frequency broadband valley transport for acoustic topology based on extended resonance

New topological rainbow trapping approach for phononic beam-foundation systems

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