Acoustic metamaterials with broadband and wide-angle impedance matching

Liu, Chenkai; Luo, Jie; Lai, Yun

doi:10.1103/physrevmaterials.2.045201

Cited by 38 publications

(23 citation statements)

References 68 publications

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“…To calculate the effective mass density eff  and compressibility eff  for our proposed system, we adopt the effective parameter retrieval method based on field averaging 38,39 . The results are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point

Chen

et al. 2020

Phys. Rev. Lett.

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We report a design and experimental realization of a three-dimensional (3D) acoustic double-zero-index medium (DZIM), whose effective mass density and compressibility are nearly zero simultaneously. The DZIM is constructed from a cubic lattice of three orthogonally-aligned metal rods in air. The combination of lattice symmetry and accidental degeneracy yields a four-fold degenerate point with conical dispersion at the Brillouin zone center, where the material becomes a 3D DZIM. Though occupying a finite volume, the 3D DZIM maintains the wave properties of a "void space" and enables rich applications. For demonstration, we fabricate an acoustic "periscope" by placing the designed 3D DZIM inside a 3D bending waveguide, and observe the unusual wave tunneling effect through this waveguide with undisturbed planar wavefront. Our findings establish a practical route to realize 3D DZIM as an effective acoustic "void space," which offers unprecedented opportunities for advanced sound manipulation.A wave propagating in a medium with one or more constitutive parameters vanishing does not accumulate any phase retardation. This characteristic can be leveraged for a number of unique wave functionalities such as wavefront engineering 1-10 , cloaking objects 8-14 , wave tunneling 15-23 , asymmetric transmission 24-26 and photonic/phononic doping [27][28][29][30][31][32] . A single-zero-index medium, with only one constitutive parameter near-zero, usually has a significant impedance mismatch with the background medium, which is undesirable for real applications. A double-zero-index medium (DZIM), with both constitutive parameters near-zero, can overcome this obstacle, owing to its finite-valued effective impedance 7-11 . In the past decade, various approaches have been proposed to

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Section: Resultsmentioning

confidence: 99%

Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point

Chen

et al. 2020

Phys. Rev. Lett.

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“…( e ) Effective parameters

and

of the 2D acoustic matching layer. Reprinted with permission from [ 309 ], DOI: , Copyright (2018) by the American Physical Society.…”

Section: Figurementioning

confidence: 99%

“… Incident-angle-dependent transmittance of acoustic waves propagating through an acoustic metamaterial matching layer with n = 4, 5, 6, 15 unit cells. Reprinted with permission from [ 309 ], DOI: , Copyright (2018) by the American Physical Society. …”

Section: Figurementioning

confidence: 99%

A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers

Rathod

2020

Sensors

173

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The coupling of waves between the piezoelectric generators, detectors, and propagating media is challenging due to mismatch in the acoustic properties. The mismatch leads to the reverberation of waves within the transducer, heating, low signal-to-noise ratio, and signal distortion. Acoustic impedance matching increases the coupling largely. This article presents standard methods to match the acoustic impedance of the piezoelectric sensors, actuators, and transducers with the surrounding wave propagation media. Acoustic matching methods utilizing active and passive materials have been discussed. Special materials such as nanocomposites, metamaterials, and metasurfaces as emerging materials have been presented. Emphasis is placed throughout the article to differentiate the difference between electric and acoustic impedance matching and the relation between the two. Comparison of various techniques is made with the discussion on capabilities, advantages, and disadvantages. Acoustic impedance matching for specific and uncommon applications has also been covered.

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“…Several other types of acoustic metamaterials have been reported, such as coiling-up space type AMs [59,60], split-ring type AMs, topological acoustics [61], fractal acoustic metamaterials [62][63][64][65][66], helical-structured metamaterials [67,68], and acoustic metasurfaces [69,70]. For coiling-up space type acoustic metamaterials, the incident acoustic waves are confined in coiled subwavelength cross-section channels, thereby resulting in extraordinary acoustic properties such as double negativity and near-zero index to a high effective refractive index of unit cells [71,72]. Acoustic waves in fluids are longitudinal scalar waves.…”

Section: Acoustic Metamaterials: a Brief Overviewmentioning

confidence: 99%

“…metasurfaces [69,70]. For coiling-up space type acoustic metamaterials, the incident acoustic waves are confined in coiled subwavelength cross-section channels, thereby resulting in extraordinary acoustic properties such as double negativity and near-zero index to a high effective refractive index of unit cells [71,72]. Acoustic waves in fluids are longitudinal scalar waves.…”

Section: Acoustic Metamaterials: a Brief Overviewmentioning

confidence: 99%

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Kumar¹,

Lee²

2020

Crystals

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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.

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Acoustic metamaterials with broadband and wide-angle impedance matching

Cited by 38 publications

References 68 publications

Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point

Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point

A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

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