The anomalous manipulation of acoustic waves based on planar metasurface with split hollow sphere

Ding, Changlin; Chen, Huaijun; Zhai, Shilong; Liu, Song; Zhao, Xiaopeng

doi:10.1088/0022-3727/48/4/045303

Cited by 60 publications

(45 citation statements)

References 24 publications

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“…It can also be easily coupled with other structure and fabricated in a simple way and low cost in experimental environment [33,34]. As an acoustic Helmholtz resonator, SHS has been proved to be suitable to fabricate AMS [35]. Since the DSHS is another kind of Helmholtz resonator with symmetry structure and possesses similar properties as the SHS, it can also be used to design AMS.…”

Section: Model Analysismentioning

confidence: 99%

Reflected wavefronts modulation with acoustic metasurface based on double-split hollow sphere

et al. 2015

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Metasurfaces with sub-wavelength thickness and planar profile have exhibited abnormal manipulation to waves that could not be realized by traditional materials. Here, we present an acoustic metasurface (AMS) model composed of double-split hollow sphere (DSHS) resonator arrays with the functionality of modulating reflected wavefronts at will. By tailoring the split-hole diameter of DSHS, the AMS can be designed to cover 2p phase shifts with a step of p/4. The acoustic waves perpendicularly and obliquely incident on the AMS can be reflected at any angle, including anomalous reflection and negative reflection. These anomalous manipulations of the reflected wave are simulated to fulfill the generalized Snell's law by projecting suitable phase gradient. Such AMS provides another path to acoustic applications such as acoustic imaging, cloaking, beam steering devices.

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Section: Model Analysismentioning

confidence: 99%

Reflected wavefronts modulation with acoustic metasurface based on double-split hollow sphere

et al. 2015

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“…Recently, Helmholtz resonators [28][29][30] and membrane [32] and pentamode metamaterial [33] based unit cells have been proposed as acoustic metasurface unit-cell designs to control the phase of the acoustic wave. However, most of these studies on metasurface unit-cell designs still suffer from being bulky, having limited bandwidth, high losses, and nonuniform reflected/transmitted wave amplitude and do not present the aptitude for reconfigurability.…”

Section: Introductionmentioning

confidence: 99%

Acoustic carpet cloak based on an ultrathin metasurface

et al. 2016

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An acoustic metasurface carpet cloak based on membrane-capped cavities is proposed and investigated numerically. This design has been chosen for allowing ultrathin geometries, although adapted to airborne sound frequencies in the range of 1 kHz (λ ≈ 30 cm), surpassing the designs reported in the literature in terms of thinness. A formulation of generalized Snell's laws is first proposed, mapping the directions of the incident and reflected waves to the metasurface phase function. This relation is then applied to achieve a prescribed wavefront reflection direction, for a given incident direction, by controlling the acoustic impedance grading along the metasurface. The carpet cloak performance of the proposed acoustic metasurface is then assessed on a triangular bump obstacle, generally considered as a baseline configuration in the literature.

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“…[12][13][14][15][16][17][18][19][20][21][22] And then some novel phenomena are demonstrated, such as the anomalous reflection and refraction, [12][13][14][15][16][17][18] and the planar acoustic axicon and lens. [19][20][21][22] Ding et al 23,24 have proposed that the split hollow sphere and double-split hollow sphere, as acoustic resonator, can be also used to construct AMS. However, they may not be effective in a broad frequency range or at a given frequency.…”

Section: Introductionmentioning

confidence: 99%

Broadband reflected wavefronts manipulation using structured phase gradient metasurfaces

et al. 2016

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Acoustic metasurface (AMS) is a good candidate to manipulate acoustic waves due to special acoustic performs that cannot be realized by traditional materials. In this paper, we design the AMS by using circular-holed cubic arrays. The advantages of our AMS are easy assemble, subwavelength thickness, and low energy loss for manipulating acoustic waves. According to the generalized Snell’s law, acoustic waves can be manipulated arbitrarily by using AMS with different phase gradients. By selecting suitable hole diameter of circular-holed cube (CHC), some interesting phenomena are demonstrated by our simulations based on finite element method, such as the conversion of incoming waves into surface waves, anomalous reflections (including negative reflection), acoustic focusing lens, and acoustic carpet cloak. Our results can provide a simple approach to design AMSes and use them in wavefront manipulation and manufacturing of acoustic devices.

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The anomalous manipulation of acoustic waves based on planar metasurface with split hollow sphere

Cited by 60 publications

References 24 publications

Reflected wavefronts modulation with acoustic metasurface based on double-split hollow sphere

Reflected wavefronts modulation with acoustic metasurface based on double-split hollow sphere

Acoustic carpet cloak based on an ultrathin metasurface

Broadband reflected wavefronts manipulation using structured phase gradient metasurfaces

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