Compressibility-near-zero acoustic metamaterial

Cselyuszka, Norbert; Secujski, Milan; Bengin, Vesna

doi:10.1016/j.physleta.2014.02.022

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…2, and compared to the same parameter extracted from FEM simulations in COMSOL Multiphysics using the approach analogous to the one developed for electromagnetic metamaterials [24,25]. An acoustic-solid interaction multi-physics module has been used, which has already been proven to give results which agree with the measurements very well [16,22]. The following parameters of the aSRR have been used: M = 88 μg, d = 32 mm, R = 8.1 mm, r = 3 mm, τ = 5 N/m.…”

Section: Theorymentioning

confidence: 99%

“…Most research in this area has been dedicated to electromagnetic metamaterials, which offer the possibility of engineering effective permeability and permittivity, resulting in phenomena such as negative phase velocity, superlensing and cloaking [1][2][3][4][5][6][7][8][9]. However, in recent years a lot of attention has also been given to the study of acoustic metamaterials, where specific design is deployed to control the values of effective compressibility and mass density [10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Novel negative mass density resonant metamaterial unit cell

2015

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel negative mass density resonant metamaterial unit cell

2015

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“…Double negative materials can be realized, for example, by a system comprising two coupled membranes with two resonance modes (monopole and dipole) [22]. In addition, zero index materials have also been extensively studied [23][24][25][26][27], by which superreflection, total transmission, and cloaking can be realized. However, previous studies of acoustic metamaterials have focused on the real parts of acoustic parameters.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere

Wei

Zhu

et al. 2022

Applied Sciences

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Acoustic conjugate metamaterials (ACMs), in which the imaginary parts of the effective complex mass density and bulk compressibility are cancelled out in the refractive index, possess the elements of loss and gain simultaneously. Previous works have focused on panel ACMs for plane wave incidence. In this paper, we explore the extraordinary scattering properties, including the acoustic equivalent lasing (AEL) and coherent perfect absorption (CPA) modes, of a three-dimensional ACM sphere, where incident spherical waves with specific topological orders could be extremely scattered and totally absorbed, respectively. Theoretical analysis and numerical simulations show that the AEL or CPA mode with a single order can be realized with a small monolayer ACM sphere with appropriate parameters. A huge (relative to incident wavelength) ACM sphere with pure imaginary parameters could support the even- (or odd-) order AEL and odd- (or even-) order CPA modes simultaneously. In addition, the AEL and/or CPA with multiple orders could be realized based on a small multilayered ACM sphere. The proposed ACM sphere may provide an alternative method to design acoustic functional devices, such as amplifiers and absorbers.

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“…However, challenges with viscothermal loss and the accurate tuning of multiple membrane resonances have prevented the practical realization of density-near-zero acoustic supercoupling devices thus far. A waveguide loaded with Helmholtz resonators in the form of low-pass filters was shown to support compressibility-near-zero properties and uniform phase through an intermediate channel [34], but again its implementation in a supercoupling experiment would require extreme precision in the realization of these arrays of resonators.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Supercoupling in a Zero-Compressibility Waveguide

et al. 2019

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Funneling acoustic waves through largely mismatched channels is of fundamental importance to tailor and transmit sound for a variety of applications. In electromagnetics, zero-permittivity metamaterials have been used to enhance the coupling of energy in and out of ultranarrow channels, based on a phenomenon known as supercoupling. These metamaterial channels can support total transmission and complete phase uniformity, independent of the channel length, despite being geometrically mismatched with their input and output ports. In the field of acoustics, this phenomenon is challenging to achieve, since it requires zero-density metamaterials, typically realized with waveguides periodically loaded with membranes or resonators. Compared to electromagnetics, the additional challenge is due to the fact that conventional acoustic waveguides do not support a cut-off for the dominant mode of propagation, and therefore zero-index can be achieved only based on a collective resonance of the loading elements. Here we propose and experimentally realize acoustic supercoupling in a dual regime, using a compressibility-near-zero acoustic channel. Rather than engineering the channel with subwavelength inclusions, we operate at the cut-off of a higher-order acoustic mode, demonstrating the realization and efficient excitation of a zero-compressibility waveguide with effective soft boundaries. We experimentally verify strong transmission through a largely mismatched channel and uniform phase distribution, independent of the channel length. Our results open interesting pathways towards the realization of extreme acoustic parameters and their implementation in relevant applications, such as ultrasound imaging, acoustic transduction and sensing, nondestructive evaluation, and sound communications.

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Compressibility-near-zero acoustic metamaterial

Cited by 19 publications

References 15 publications

Novel negative mass density resonant metamaterial unit cell

Novel negative mass density resonant metamaterial unit cell

Acoustic Equivalent Lasing and Coherent Perfect Absorption Based on a Conjugate Metamaterial Sphere

Acoustic Supercoupling in a Zero-Compressibility Waveguide

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