A5066578681- Acoustic Wave Phenomena Research
- Metamaterials and Metasurfaces Applications
- Ultrasound and Hyperthermia Applications
- Photoacoustic and Ultrasonic Imaging
- Underwater Acoustics Research
- Noise Effects and Management
- Aerodynamics and Acoustics in Jet Flows
- Ultrasonics and Acoustic Wave Propagation
- Ultrasound Imaging and Elastography
- Topological Materials and Phenomena
- Hearing Loss and Rehabilitation
- Speech and Audio Processing
- Music Technology and Sound Studies
- Ultrasound and Cavitation Phenomena
- Cellular and Composite Structures
- Acoustic Wave Resonator Technologies
- Advanced Antenna and Metasurface Technologies
- Graphene research and applications
- Quantum Mechanics and Non-Hermitian Physics
- Thermography and Photoacoustic Techniques
- Advanced Materials and Mechanics
- Seismic Waves and Analysis
- Structural Analysis and Optimization
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
Pennsylvania State University
2020-2025
North Carolina State University
2013-2023
Virginia Tech
2023
University of Illinois Urbana-Champaign
2023
Park University
2023
Xinxiang Medical University
2012-2021
Acoustics (Norway)
2006-2020
Nanjing University
2007-2019
University of North Carolina at Chapel Hill
2014-2019
Collaborative Innovation Center of Advanced Microstructures
2019
In this study, we show that robust and tunable acoustic asymmetric transmission can be achieved through gradient-index metasurfaces by harnessing judiciously tailored losses. We theoretically prove the wave behavior stems from loss-induced suppression of high order diffraction. further experimentally demonstrate novel phenomenon. Our findings could provide new routes to broaden applications for lossy metamaterials metasurfaces.
In this letter, a class of honeycomb acoustic metamaterial possessing lightweight and yet sound-proof properties is designed, theoretically proven, then experimentally verified. It here reported that the proposed having remarkably small mass per unit area at 1.3 kg/m2 can achieve low frequency (<500 Hz) sound transmission loss (STL) consistently greater than 45 dB. Furthermore, sandwich panel which incorporates as core material yields STL 50 dB frequencies. The promising for...
This paper reports on the experimental observation of topologically protected edge state and exceptional point in an open Non-Hermitian system. While theoretical underpinning is generic to wave physics, simulations experiments are performed for acoustic system whose structure has non-trivial topological properties that can be characterized by Chern number provided a synthetic dimension introduced. Unidirectional reectionless propagation, hallmark point, unambiguously observed both experiments.
Schroeder diffuser is a classical design, proposed over 40 years ago, for artificially creating optimal and predictable sound diffuse reflection. It has been widely adopted in architectural acoustics it also shown substantial potential noise control, ultrasound imaging, microparticle manipulation, among others. The conventional diffuser, however, considerable thickness on the order of one wavelength, severely impeding its applications low frequency sound. In this paper, new class ultra-thin...
Over the past decade there has been a great amount of research effort devoted to topic acoustic metamaterials (AMMs). The recent development AMMs enlightened way manipulating sound waves. Several potential applications such as low-frequency noise reduction, cloaking, angular filtering, subwavelength imaging, and energy tunneling have proposed implemented by so-called membrane- or plate-type AMMs. This paper aims offer thorough overview on underlying mechanism these types for tuning effective...
In this Letter, we report on the design and experimental characterization of a broadband acoustic hyperbolic metamaterial. The proposed metamaterial consists multiple arrays clamped thin plates facing y direction is shown to yield opposite signs effective density in x directions below certain cutoff frequency, therefore, yielding dispersion. Partial focusing subwavelength imaging are experimentally demonstrated at frequencies between 1.0 2.5 kHz. could open up new possibilities for wave...
We present a design of acoustic metasurfaces yielding asymmetric transmission within certain frequency band. The consists layer gradient-index metasurface and low refractive index metasurface. Incident waves are controlled in wave vector dependent manner to create strong transmission. Numerical simulations show that the approach provides high contrast between two incident directions designed This is further verified by experiments. Compared previous designs, proposed yields compact planar...
Abstract Acoustic holographic rendering in complete analogy with optical holography are useful for various applications, ranging from multi-focal lensing, multiplexed sensing and synthesizing three-dimensional complex sound fields. Conventional approaches rely on a large number of active transducers phase shifting circuits. In this paper we show that by using passive metamaterials as subwavelength pixels, can be achieved without cumbersome circuitry only single transducer, thus significantly...
Composite honeycomb sandwich panels have been adopted in a wide range of applications owing to their excellent mechanical properties. This paper demonstrates design composite metasurface panel that can achieve 90% sound absorption from 600 1000 Hz with thickness less than 30 mm. The is comprised periodically and horizontally arranged "supercells" which consist unit cells different geometric parameters (pore size). Two analytical models (Helmholtz resonator model micro-perforated model) are...
Medical techniques such as transcranial ultrasound beam focusing suffer from energy losses and distorted acoustic fields. Researchers show how metamaterials can be used to enhance transmission.
This letter investigates a flow-free, pseudospin-based acoustic topological insulator. Zone folding, strategy originated from photonic crystal, is used to form double Dirac cones in phononic crystal. The lattice symmetry of the crystal broken by tuning size center "atom" unit cell order open nontrivial gap. Robust sound one-way propagation demonstrated both numerically and experimentally. study provides flexible approach for realizing insulators, which are promising applications such as...
Previous research has attempted to minimize the influence of loss in reflection- and transmission-type acoustic metasurfaces. This letter shows that, by treating metasurface as a non-Hermitian system harnessing loss, unconventional wave behaviors that do not exist lossless metasurfaces can be uncovered. Specifically, we theoretically experimentally demonstrate mirror featuring extremely asymmetrical reflection at exception point. As an example, is designed have high-efficiency...
Acoustic metasurfaces have enabled unprecedented control over acoustic waves, offering opportunities in areas such as holographic rendering, sound absorption, and communication. Despite the steady progress made this field, most metasurface designs are passive that they only provide static functionalities. Here, a reconfigurable active metalens is implemented to showcase scanning of focus along arbitrary trajectories free space with help previously developed platform. Each unit cell contains...
Conventional sound shielding structures typically prevent fluid transport between the exterior and interior. A design of a two-dimensional acoustic metacage with subwavelength thickness which can shield waves from all directions while allowing steady flow is presented in this paper. The structure designed based on gradient-index metasurfaces composed open channels shunted Helmholtz resonators. In-plane at an arbitrary angle incidence reflected due to strong parallel momentum surface, leads...
Building upon the bulk-boundary correspondence in topological phases of matter, disclinations have recently been harnessed to trap fractionally quantized density states (DOS) classical wave systems. While these fractional DOS associated localized disclination's core, such are not protected from deconfinement due breaking chiral symmetry, generally leading resonances which, even principle, finite lifetimes and suboptimal confinement. Here, we devise experimentally validate acoustic lattices a...
Computational models of acoustic wave propagation are frequently used in transcranial ultrasound therapy, for example, to calculate the intracranial pressure field or phase delays correct skull distortions. To allow intercomparison between different modeling tools and techniques by community, an international working group was convened formulate a set numerical benchmarks. Here, these benchmarks presented, along with results. Nine increasing geometric complexity defined. These include...
An experiment shows the existence of $\mathbb{Z}$-classified multiple chiral topological phase, which requires both symmetry and a unique condition where long-range hopping is stronger than nearest-neighboring one.
Abstract Communication with hand gestures plays a significant role in human‐computer interaction by providing an intuitive and natural way for humans to communicate machines. Ultrasound‐based devices have shown promising results contactless gesture recognition without requiring physical contact. However, it is challenging fabricate densely packed wearable ultrasound array. Here, stretchable array demonstrated closely transducer elements fabricated using surface charge engineering between...
High intensity focused ultrasound (HIFU) has recently emerged as a promising alternative approach for thrombolysis. However, the high acoustic energy required by HIFU could elicit thermal damage bioeffects, impeding clinical translation of this technique. This paper investigates use dual-frequency (DFFU) mediated microbubbles (MBs) to minimize power thrombolysis in vitro. It was found that MBs, with sufficient concentration, significantly lower threshold both DFFU and single-frequency...