3D acoustic metasurface carpet cloak based on groove structure units

Ji, Wen-Qian; Wei, Qi; Zhu, Xing-Feng; Wu, Da‐Jian

doi:10.1088/1361-6463/ab216a

Cited by 23 publications

(11 citation statements)

References 31 publications

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“…It means that the performance of the ground illusion is quite good when the incident angle is small [13]. For quantitative analysis, the average visibility [55,56]…”

Section: The Ground Illusionmentioning

confidence: 99%

An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Wang

Chen

et al. 2020

J. Phys. D: Appl. Phys.

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Acoustic metasurfaces are attractive due to the feasibility of unprecedented modulation for reflected or refracted waves. However, most proposed acoustic metasurfaces are planar, which limits the application of metasurfaces. An acoustic metasurface with a curved surface shape is rarely reported, especially for the three-dimensional case. In this paper, the three-dimensional generalized Snell’s law for reflection at an arbitrarily curved surface is derived. Then tunable curved metasurfaces composed of the corrugated holes unit-cells are designed. And anomalous reflection, focusing and ground illusion are numerically demonstrated. The design methodology proposed in this paper expands the application range of acoustic metasurfaces and paves the way to some special application realms, such as wearable acoustic devices and acoustic devices with curved surfaces.

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“…It means that the performance of the ground illusion is quite good when the incident angle is small [13]. For quantitative analysis, the average visibility [55,56]…”

Section: The Ground Illusionmentioning

confidence: 99%

An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Wang

Chen

et al. 2020

J. Phys. D: Appl. Phys.

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“…Acoustic invisibility in free space is often limited to a narrow bandwidth or only effective along a specific direction, especially for large targets. On the other hand, important experimental demonstrations of invisibility cloaks have already been given for cloaking under different circumstances [29][30][31][32][33][34][35] such as ground cloaks, often composed of metafluids with anisotropic mass density. [17,18] Other manners of wave manipulation, e.g., wave-guiding and beam-steering, can be achieved similarly with coordinate transformation and metafluids.…”

Section: Introductionmentioning

confidence: 99%

Sound-transparent anisotropic media for backscattering-immune wave manipulation

Kan

Pan

2022

Chinese Phys. B

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The scattering behavior of the anisotropic acoustic medium is analyzed to reveal the possibility of routing acoustic signals through the anisotropic layers with no backscattering loss. The sound-transparent effect of such medium is achieved by independently modulating the anisotropic effective acoustic parameters in a specific order, and experimentally observed in a bending waveguide by arranging the subwavelength structures in the bending part according to transformation acoustics. With the properly designed filling structures, the original distorted acoustic field in the bending waveguide is restored as if the wave travels along a straight path. The transmitted acoustic signal is maintained nearly the same as the incident modulated Gaussian pulse. The proposed schemes and the supporting results could be instructive for further acoustic manipulations such as wave steering, cloaking and beam splitting.

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“…AMMs are artificial functional materials that allow sound wave control with subwavelength size. They show incomparable advantages for utilization in sound absorption [2], abnormal refraction [3], total reflection [4], acoustic topology [5], and acoustic carpet cloaks [6]. Of these, sound absorption with subwavelength size has received considerable attention, leading to the development of many types of sound absorption metamaterials.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency sound absorption by a nested and ventilated metasurface based on multi-slit synergetic resonance

Liu¹,

Wu²,

Ma³

2021

J. Phys. D: Appl. Phys.

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A nested, sound-absorbing, ventilated metasurface was proposed based on multi-slit synergetic resonance, which could simultaneously achieve high-efficiency (>0.85), sound absorption, and effective (speed ratio >0.67) ventilation in a frequency range of 470–657 Hz. The unit of the sound-absorbing and ventilated metasurface (USAVM) consisted of a ventilation channel and a stepped micro-slit absorber, which could effectively trade-off ventilation and absorption performance. The sound absorption mechanism was revealed via the coupling of the ventilation channel and micro-slit absorber, relying on strong air friction and the slit walls near the resonance frequency. Furthermore, after a parametric study of the USAVM, a compact nested metasurface with a thickness of only 39.1 mm (1/17 wavelength) was constructed using eight parallel USAVMs, with a surface panel area of only 1/7 of the traditional parallel structure. Finally, the sound absorption and ventilation performance of the nested metasurface were verified experimentally. In addition, the absorption bandwidth could be further improved by using more USAVMs. This work provides a new possibility for achieving highly efficient sound absorption with a subwavelength ventilated structure in a low-frequency range that could be applied in buildings or industrial areas.

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3D acoustic metasurface carpet cloak based on groove structure units

Cited by 23 publications

References 31 publications

An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

An arbitrarily curved acoustic metasurface for three-dimensional reflected wave-front modulation

Sound-transparent anisotropic media for backscattering-immune wave manipulation

High-efficiency sound absorption by a nested and ventilated metasurface based on multi-slit synergetic resonance

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