Double-negative acoustic metamaterial based on meta-molecule

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

doi:10.1088/0022-3727/46/47/475105

Cited by 50 publications

(41 citation statements)

References 30 publications

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“…Therefore, the working frequency of the metamaterial can be modulated by changing the dimensions of the meta-molecule. The locally resonant essence35373839 of the present metamaterial ensures a non-significant influence among adjacent units30313233; therefore, a broadband double-negative metamaterial can be obtained by stacking meta-molecules with different working frequencies. Simulations and experiments have revealed the number and size of the units for this model.…”

Section: Resultsmentioning

confidence: 98%

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Inverse Doppler Effects in Broadband Acoustic Metamaterials

Zhai

Zhao

Liu

et al. 2016

Sci Rep

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The Doppler effect refers to the change in frequency of a wave source as a consequence of the relative motion between the source and an observer. Veselago theoretically predicted that materials with negative refractions can induce inverse Doppler effects. With the development of metamaterials, inverse Doppler effects have been extensively investigated. However, the ideal material parameters prescribed by these metamaterial design approaches are complex and also challenging to obtain experimentally. Here, we demonstrated a method of designing and experimentally characterising arbitrary broadband acoustic metamaterials. These omni-directional, double-negative, acoustic metamaterials are constructed with ‘flute-like’ acoustic meta-cluster sets with seven double meta-molecules; these metamaterials also overcome the limitations of broadband negative bulk modulus and mass density to provide a region of negative refraction and inverse Doppler effects. It was also shown that inverse Doppler effects can be detected in a flute, which has been popular for thousands of years in Asia and Europe.

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Section: Resultsmentioning

confidence: 98%

“…Acoustic artificial meta-molecules can simultaneously produce negative mass density and bulk modulus35; as such, a meta-molecule cluster is formed by combining meta-molecules with different resonant frequencies in a particular arrangement.…”

Section: Resultsmentioning

confidence: 99%

Inverse Doppler Effects in Broadband Acoustic Metamaterials

Zhai

Zhao

Liu

et al. 2016

Sci Rep

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“…In this work, the DSHS and its prior structure of split hollow sphere (SHS) are artificial acoustic resonators which have realized negative-modulus AMM [30][31][32][33][34] near the resonant frequency due to its acoustic local resonance. 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].…”

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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“…Besides, the fabrication of gradient index lens is relatively complicated, and they can only realize limited phase shifts. Recent investigations in metamaterials have opened up new avenues for manufacturing various novel devices [6][7][8][9][10][11][12][13], in which the electromagnetic metasurface as a new approach has attracted tremendous interests of researchers [14][15][16][17][18][19]. The arbitrary modulation of electromagnetic waves could be realized just via ultrathin artificial composite materials, including bending of the direction of propagating waves, abnormal transmission and reflection, and planar lenses.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of transmitted wave front using ultrathin planar acoustic metasurfaces

et al. 2015

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Nowadays, the acoustic devices are developing toward miniaturization. However, conventional materials can hardly satisfy the requirements because of their large size and complex manufacturing process. The introduction of acoustic metasurfaces has broken these restrictions, as they are able to manipulate sound waves at will by utilizing ultrathin planar metamaterials. Here, a simple acoustic metasurface is designed and characterized, whose microstructure is constructed with a cavity filled with air and two elastic membranes on the ends of cavity. By appropriately optimizing the configurations of microstructures, the steering of transmitted wave trajectory is demonstrated, and some extraordinary phenomena are realized at 3.5 kHz, such as planar acoustic axicon, acoustic lens, the conversion from spherical waves to plane waves, and the transformation from propagating waves to surface waves.

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Double-negative acoustic metamaterial based on meta-molecule

Cited by 50 publications

References 30 publications

Inverse Doppler Effects in Broadband Acoustic Metamaterials

Inverse Doppler Effects in Broadband Acoustic Metamaterials

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

Manipulation of transmitted wave front using ultrathin planar acoustic metasurfaces

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