Physical acoustics
View article: Transverse spin and surface waves in acoustic metamaterials
Transverse spin and surface waves in acoustic metamaterials Open
We consider spin angular momentum density in inhomogeneous acoustic fields:\nevanescent waves and surface waves at interfaces with negative-density\nmetamaterials. Despite being purely longitudinal (curl-free), acoustic waves\npossess intr…
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Subwavelength Sound Focusing and Imaging Via Gradient Metasurface-Enabled Spoof Surface Acoustic Wave Modulation Open
Although focusing sound waves beyond the diffraction limit offers possibilities for many applications, such as acoustic detection, sensing, and imaging, experimental realization remains a challenge. This study offers a straightforward way …
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Acoustic levitation of an object larger than the acoustic wavelength Open
Levitation and manipulation of objects by sound waves have a wide range of applications in chemistry, biology, material sciences, and engineering. However, the current acoustic levitation techniques are mainly restricted to particles that …
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On superscattering of sound waves by a lattice of disk-shaped cavities in a soft material Open
A metasurface comprising cavities in a soft medium has been proven to be highly efficient for control of water-borne sound waves. We formulate an analytical model to predict the acoustic performance of a soft elastic medium embedded with d…
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Acoustic radiation force on small spheres due to transient acoustic fields Open
Acoustic radiation force is a net force experienced by an object under the action of an acoustic wave. Most theoretical models require the acoustic wave to be periodic, if not purely monofrequency, and are therefore irrelevant for the stud…
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Thin structured rigid body for acoustic absorption Open
We present a thin acoustic metamaterial absorber, comprised of only rigid metal and air, that gives rise to near unity absorption of airborne sound on resonance. This simple, easily fabricated, robust structure comprising a perforated meta…
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Introduction to the special issue on machine learning in acoustics Open
The use of machine learning (ML) in acoustics has received much attention in the last decade. ML is unique in that it can be applied to all areas of acoustics. ML has transformative potentials as it can extract statistically based new info…
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Liquid-assisted tunable metasurface for simultaneous manipulation of surface elastic and acoustic waves Open
A tunable and multi-functional one-dimensional metasurface, which is formed by engraving periodic semi-ellipse grooves on the surface of an aluminum half-space, is proposed in this paper. One characteristic of the metasurface is the manipu…
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Temperature-controlled acoustic surface waves Open
Conventional approaches to the control of acoustic waves propagating along boundaries between fluids and hard grooved surfaces are limited to the manipulation of surface geometry. Here we demonstrate for the first time, through theoretical…
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Crack Front Interaction with Self-Emitted Acoustic Waves Open
The interaction of a propagating crack in implanted silicon with self-emitted acoustic waves results in periodic patterns on fractured surfaces. Direct measurement of the acoustic emission ahead of the fracture front shows the emergence of…
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Molecular dynamics simulations of acoustic absorption by a carbon nanotube Open
Acoustic absorption by a carbon nanotube (CNT) was studied using molecular dynamics (MD) simulations in a molecular domain containing a monatomic gas driven by a time-varying periodic force to simulate acoustic wave propagation. Attenuatio…
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Surface acoustic waves in one-dimensional piezoelectric phononic crystals with symmetric unit cell Open
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Broadband reflected wavefronts manipulation using structured phase gradient metasurfaces Open
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 advan…
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Directional acoustic transmission based on metamaterials Open
To explore the simple low-loss operation of directional acoustic transmission technology, the propagation of acoustic waves in resonant phononic crystals was studied, and a transmission model based on acoustic metamaterials was constructed…
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Acoustic Focusing Imaging Characteristics Based on Double Negative Locally Resonant Phononic Crystal Open
To achieve high-efficiency and high-resolution acoustic focusing, we used artificial periodic acoustic structures composed of cell arrays to manipulate the acoustic transmission wave front, and used finite element software to simulate the …
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Acoustic propagation characteristics of heteromorphic metamaterials Open
To explore the propagation characteristics of acoustic waves in heterogeneous acoustic materials, we studied the propagation of acoustic waves in resonant phononic crystals. We identified the vibration mechanism of two-dimensional three-co…
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Acoustic diamond resonators with ultrasmall mode volumes Open
Quantum acoustodynamics (QAD) is a rapidly developing field of research,\noffering possibilities to realize and study macroscopic quantum-mechanical\nsystems in a new range of frequencies, and implement transducers and new types\nof memori…
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Holographic extraction of plane waves from an ultrasound beam for acoustic characterization of an absorbing layer of finite dimensions Open
For the acoustic characterization of materials, a method is proposed for interpreting experiments with finite-sized transducers and test samples in terms of the idealized situation in which plane waves are transmitted through an infinite p…
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Vector network analyzer measurement of the amplitude of an electrically excited surface acoustic wave and validation by X-ray diffraction Open
Surface acoustic waves are used in magnetism to initiate magnetization switching, in microfluidics to control fluids and particles in lab-on-a-chip devices, and in quantum systems like two-dimensional electron gases, quantum dots, photonic…
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Application of Finite Elements Method for Improvement of Acoustic Emission Testing Open
The paper deals with the acoustic emission sensor modeling by means of FEM system COSMOS/M. The following types of acoustic waves in the acoustic emission sensors are investigated: the longitudinal wave and transversal wave. As a material …
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Acoustic focusing effect based on artificial periodic structure Open
To achieve high-efficiency acoustic focusing, an artificial periodic acoustic structure composed of two-dimensional three-component cell arrays was used to manipulate the transmission wave fronts of acoustic waves, and the acoustic field c…
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Measurement of surface acoustic wave resonances in ferroelectric domains by microwave microscopy Open
Surface Acoustic Wave (SAW) resonances were imaged within a closed domain in the ferroelectric LiTaO3 via scanning Microwave Impedance Microscopy (MIM). The MIM probe is used for both SAW generation and measurement, allowing the contact-le…
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Semi-insulating 4H-SiC lateral bulk acoustic wave resonators Open
Silicon carbide (SiC) excels in its outstanding mechanical properties, which are widely studied in microelectromechanical systems. Recently, the mechanical tuning of color centers in 4H-SiC has been demonstrated, broadening its application…
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Trapping in acoustic standing waves: Effect of liquid drop compressibility Open
The Reflections series takes a look back on historical articles from The Journal of the Acoustical Society of America that have had a significant impact on the science and practice of acoustics.
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Robust acoustic wave manipulation of bubbly liquids Open
Experiments with water–air bubbly liquids when exposed to acoustic fields of frequency ∼100 kHz and intensity below the cavitation threshold demonstrate that bubbles ∼30 μm in diameter can be “pushed” away from acoustic sources by acoustic…
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Progress in acoustic measurements and geoacoustic applications Open
Geoacoustic exploration is a rapidly evolving field investigating underground rock formations and sediment environments through acoustic waves. In this paper, we present a review of recent research progress, focusing on newly discovered ph…
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Inverse-designed acoustic metasurfaces for broadband sound absorption Open
Acoustic metasurfaces are widely used for noise attenuation due to their outstanding acoustic performance and subwavelength characteristics. The paper introduces a topology-optimized inverse design approach for broadband sound-absorbing me…
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Acoustic Propagation Characteristics of Metamaterials With Tubular Structures Open
To generate acoustic waves with abnormal transmission characteristics different from those of traditional natural acoustic materials, we studied the propagation of acoustic waves in resonant phononic crystals. We identified the vibration m…
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Outer Acoustic Streaming Flow Driven by Asymmetric Acoustic Resonances Open
While boundary-driven acoustic streaming resulting from the interaction of sound, fluids and walls in symmetric acoustic resonances have been intensively studied in the literature, the acoustic streaming fields driven by asymmetric acousti…
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Multi-functional programmable active acoustic meta-surface: Acoustic switch, acoustic barrier, and acoustic transmitter Open
An ultra-sparse, broadband programmable Active Acoustic Meta-surface (AAMS) that is demonstrated to function as a multi-functional Active Acoustic Meta-device is developed. Functionalities Acoustic Barrier (AB), Acoustic Switch (AS), and A…