Broadband directional acoustic waveguide with high efficiency

Yuan, Bo; Liang, Bin; Tao, Jianmin; Zou, Xin‐Ye; Cheng, Jianchun

doi:10.1063/1.4739081

Cited by 75 publications

(34 citation statements)

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“…5 To break through the intrinsic limitations of nonlinear including transmission efficiency and bandwidth, etc., considerable efforts have been and continue to be dedicated to the investigation on linear acoustic one-way structures with improved performances by employing different structures, 6-14 such as grating structures, 6,7 and phononic crystals [8][9][10][11][12][13] or metamaterials. 14 However, the acoustic paths in existing models are either totally blocked 7,9,14 or blocked by scatterers with spacing distances smaller than the working wavelength, 6,8,[10][11][12][13] which cannot allow other entities inside to pass freely (e.g., fluids or objects). A unidirectional acoustic structure which has an unblocked channel should be highly desirable in a large variety of practical scenarios, such as ventilation ducts or practical corridors with special acoustical functionalities.…”

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confidence: 99%

“…Acoustic analogies of electrical diodes, which have the extraordinary property to allowing the acoustic wave pass along one direction while blocking the transmission along the opposite direction, have recently given rise to great interests for both the physics and engineering communities due to the rich physics and potential applications. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The first prototype of an "acoustic diode" is composed of a nonlinear medium and an acoustic filter, 1-3 and followed by some other designs with different mechanisms such as nonlinear bifurcation 4 and active method. 5 To break through the intrinsic limitations of nonlinear including transmission efficiency and bandwidth, etc., considerable efforts have been and continue to be dedicated to the investigation on linear acoustic one-way structures with improved performances by employing different structures, 6-14 such as grating structures, 6,7 and phononic crystals [8][9][10][11][12][13] or metamaterials.…”

mentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] The first prototype of an "acoustic diode" is composed of a nonlinear medium and an acoustic filter, 1-3 and followed by some other designs with different mechanisms such as nonlinear bifurcation 4 and active method. 5 To break through the intrinsic limitations of nonlinear including transmission efficiency and bandwidth, etc., considerable efforts have been and continue to be dedicated to the investigation on linear acoustic one-way structures with improved performances by employing different structures, 6-14 such as grating structures, 6,7 and phononic crystals [8][9][10][11][12][13] or metamaterials. 14 However, the acoustic paths in existing models are either totally blocked 7,9,14 or blocked by scatterers with spacing distances smaller than the working wavelength, 6,8,[10][11][12][13] which cannot allow other entities inside to pass freely (e.g., fluids or objects).…”

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Broadband unidirectional transmission of sound in unblocked channel

Zhu

Zou

Liang

et al. 2015

Applied Physics Letters

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We have designed and experimentally fabricated a straight channel capable of realizing unidirectional acoustic transmission within a broad band while leaving a gap much wider than the wavelength that may serve as a passage for other entities such as fluids or objects. This extraordinary feature stems from a distinctly different mechanism that directs the sound path asymmetrically by employing acoustic metasurfaces. The numerical and experimental results agree quite well with the theoretical predictions. Our scheme may open up avenue for the design of acoustic one-way devices and have potentials in various applications such as architectural acoustics or medical ultrasound.

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Broadband unidirectional transmission of sound in unblocked channel

Zhu

Zou

Liang

et al. 2015

Applied Physics Letters

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“…In their history, phononic structures have been engineered with phonon dispersion curves showing frequency band-gaps (Bragg gaps) for longitudinal and shear waves [1][2][3][4] as well as passing bands with unique refractive properties such as negative refraction [5][6][7][8][9][10][11] and zero-angle refraction. [12][13][14] Several useful applications have been suggested from these spectral (ω-space) and wave vector (k-space) properties, such as (1) materials to isolate vibrations, 15,16 (2) composites to guide acoustic and elastic waves [17][18][19][20][21] and (3) devices to focus/collimate phonons. [22][23][24] Similar functionalities have been demonstrated for semi-infinite systems.…”

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Optically tunable acoustic wave band-pass filter

2014

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The acoustic properties of a hybrid composite that exhibits both photonic and phononic behavior are investigated numerically with finite-element and finite-difference time-domain simulations. The structure is constituted of a periodic array of photonic resonant cavities embedded in a background superlattice. The resonant cavities contain a photo-elastic chalcogenide glass that undergoes atomic-scale structural reorganization when irradiated with light having energy close to its band-gap. Photo-excitation of the chalcogenide glass changes its elastic properties and, consequently, augments the acoustic transmission spectrum of the composite. By modulating the intensity of light irradiating the hybrid photonic/phononic structure, the position and spectral width of phonon passing-bands can be controlled. This demonstration offers the technological platform for optically-tunable acoustic wave band-pass filters.

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“…the optical device proposed in [6][7][8]. These advances have been able to dramatically improve: comfort in noisy environments, the stealth of noisy or soundreflecting objects, and the quality of non-destructive testing or medical imaging with ultrasound [9][10][11]. Moreover, they have made positive contributions to features like shock protection and interface identification [12].…”

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Asymmetric Acoustic Propagation of Wave Packets Via the Self-Demodulation Effect

et al. 2015

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This article presents the experimental characterization of nonreciprocal elastic wave transmission in a single-mode elastic waveguide. This asymmetric system is obtained by coupling a selection layer with a conversion layer: the selection component is provided by a phononic crystal, while the conversion is achieved by a nonlinear self-demodulation effect in a 3D unconsolidated granular medium. A quantitative experimental study of this acoustic rectifier indicates a high rectifying ratio, up to 10 6 , with wide band (10 kHz) and an audible effect. Moreover, this system allows for wave-packet rectification and extends the future applications of asymmetric systems.Over the past decade, the development of asymmetric systems operating on acoustic waves has proven to be a real challenge given the numerous applications both in optics and for radio-waves [1]. Research on unidirectional transmission devices for acoustic and elastic waves, i.e. permitting the wave energy to pass through in one direction but not the other, has led to applications, such as energy control, energy harvesting or accumulation, the transistor effect, logic gates and the memory effect for thermal devices [2][3][4][5], as well as to operations on signals and data, e.g. the optical device proposed in [6][7][8]. These advances have been able to dramatically improve: comfort in noisy environments, the stealth of noisy or soundreflecting objects, and the quality of non-destructive testing or medical imaging with ultrasound [9-11]. Moreover, they have made positive contributions to features like shock protection and interface identification [12].It has been clearly recalled in recent articles that to obtain an asymmetric transmission of waves capable of replicating the effect of an isolator, the reciprocity of a wave needs to be broken [1,13]. To achieve this reciprocity break, most widely known solutions consist of using nonlinearity, breaking the time invariance of the system by modulating some of its properties over time, or else biasing the system with a vectorial field [14,15] whose effect differs between forward and backward propagation (e.g. the magnetic field for the Faraday isolator [1]). In acoustics, asymmetric systems relying on nonlinearity have been based, for example, on the second harmonic generation [16,17] or the bifurcation process [18]. In both cases, the system is composed of a nonlinear medium (bubbly water) [16] or localized nonlinear element (a nonlinear defect in the granular chain) [18], thus converting the acoustic energy into different frequencies than the emitted one. Futhermore, a selection layer opaque to the initially emitted frequencies is laid out on one side of the nonlinear frequency converter; this might consist of a phononic crystal with a forbidden band gap. In one propagation direction, the emitted wave impinges the selection layer and is nearly totally reflected. In the other direction, the emitted frequencies are altered in the nonlinear medium and, provided an appropriate design, transmitted through the select...

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Broadband directional acoustic waveguide with high efficiency

Abstract: Articles you may be interested inAcoustic waveguiding by pliable conduits with axial cross sections as linear waveguides in two-dimensional sonic crystals

Cited by 75 publications

References 23 publications

Broadband unidirectional transmission of sound in unblocked channel

Broadband unidirectional transmission of sound in unblocked channel

Optically tunable acoustic wave band-pass filter

Asymmetric Acoustic Propagation of Wave Packets Via the Self-Demodulation Effect

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