Negative acoustic index metamaterial

Fok, Lee; Zhang, Xiang

doi:10.1103/physrevb.83.214304

Cited by 96 publications

(54 citation statements)

References 44 publications

(51 reference statements)

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“…The vast range of phenomena associated with sound propagion has led to applications to acoustic focusing, 11,[25][26][27] waveguiding, 28 cloaking, [29][30][31][32][33] negative refraction, 11,34,35 resonant transmission through hole arrays, 9,[36][37][38][39][40] and enhanced absorption, 41 which are providing a major focus of attention. In particular, cloaking has been predicted for both elastic 29 and acoustic [30][31][32] waves, including acoustic carpets.…”

Section: Introductionmentioning

confidence: 99%

Negative refraction and backward waves in layered acoustic metamaterials

Christensen

Abajo

2012

Phys. Rev. B

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We investigate layered acoustic metamaterials capable of exhibiting a wide variety of wave propagation phenomena, including backward and forward waves with and without negative refraction. The metamaterials are formed by periodically perforated hard plates, which we describe analytically in the limit of small holes compared to both the period and the separation between plates. In particular, we derive expressions for the index of refraction and the transmission and reflection coefficients of finite slabs. We provide illustrative examples of near fields for all four combinations of backward and forward waves with and without negative refraction, along with dispersion diagrams that explain the observed behavior. A comprehensive study of the range of geometrical parameters in which these distinct phenomena are observed is presented as well. These metamaterials hold great promise for achieving full control of sound using simple structures, with potential application to acoustic technologies relying on subwavelength control and imaging of sound.

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Section: Introductionmentioning

confidence: 99%

Negative refraction and backward waves in layered acoustic metamaterials

Christensen

Abajo

2012

Phys. Rev. B

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“…So, the present study leads us to conclude that fin-based metamaterial structures are not able to exhibit the predicted double-negative behavior because of the strong dissipation associated with viscothermal losses. A large amount of losses has also been reported in other rigid-based structures with embedded resonances [15,20], where the lack of a significant signal in the transmitted energy made them unfeasible for developing practical devices. These results may indicate that viscothermal losses are relevant to any rigid-based doublenegative metamaterials.…”

Section: Discussionmentioning

confidence: 99%

“…Metamaterials with a negative bulk modulus were soon demonstrated using a variety of artificial structures [8][9][10][11]. Artificial structures behaving as doublenegative metamaterials have been proposed in the last decade [7,[12][13][14][15][16][17][18], but only a few have been experimentally demonstrated [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

Viscothermal Losses in Double-Negative Acoustic Metamaterials

2017

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The influence of losses in double-negative metamaterial slabs recently introduced by Graciá-Salgado et al. [Phys. Rev. B 88, 224305 (2013)] is comprehensively studied. Viscous and thermal losses are considered in the linearized Navier-Stokes equations with no flow. Despite the extremely low thicknesses of boundary layers associated with each type of losses, the double-negative behavior is totally suppressed for the rigid structures under analysis. In other words, almost 100% of the energy transmitted into the slab is dissipated by viscothermal effects, in agreement with experimental data. Simulations undertaken for larger structures, using scale factors of up to 20 times, show that double-negative behavior is never recovered. The huge dissipation obtained by these structures leads us to propose them as interesting alternatives to conventional absorbers for specific situations, e.g., when treating low frequencies or when the excitation is narrow banded.

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“…Although a number of double negativity (DN) acoustic metamaterials have been investigated [7][8][9][10][11][12][13][14][15], there are few reports in literature on DN elastic metamaterials. Among the elastic metamaterials that have been published, Wang theoretically investigated the mechanism of negative mass and/or negative modulus of lumped mass models [16].…”

Section: Introductionmentioning

confidence: 99%

Design of double negativity elastic metamaterial

Sun

2015

International Journal of Smart and Nano Materials

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A metamaterial model that possesses simultaneously negative effective mass density and negative effective Young's modulus is proposed in this study. Dispersion curves and dynamic responses of the model are investigated. In the double negative frequency region, it is demonstrated that the phase velocity is negative. In addition, it was found that the band gap region of the metamaterial can be predicted accurately by taking parts of single-unit cell to analyze the steady-state response. The design is also fabricated by a 3D printer.

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Negative acoustic index metamaterial

Cited by 96 publications

References 44 publications

Negative refraction and backward waves in layered acoustic metamaterials

Negative refraction and backward waves in layered acoustic metamaterials

Viscothermal Losses in Double-Negative Acoustic Metamaterials

Design of double negativity elastic metamaterial

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