We present the design, fabrication, and performance analysis for a class of two-dimensional acoustic cloaking coatings in air. Our approach takes advantage of transformation acoustics and linear coordinate transformations that result in shells which are homogeneous, broadband, and compact. The required material parameters are highly anisotropic; however, we show that they are easily achievable in practice in metamaterials made of perforated plastic plates. The good performance of the fabricated design is assessed from measurements of the sound field produced around the cloak by a broadband source. The remarkably low complexity of the device made of perforated plastic plates shows that sound in air can be fully and effectively manipulated using realizable transformation acoustics devices.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.106.253901 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sparse high-dimensional decomposition of non-primary auditory cortical receptive fields.
PLoS Comput Biol
January 2025
Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland, United States of America.
Characterizing neuronal responses to natural stimuli remains a central goal in sensory neuroscience. In auditory cortical neurons, the stimulus selectivity of elicited spiking activity is summarized by a spectrotemporal receptive field (STRF) that relates neuronal responses to the stimulus spectrogram. Though effective in characterizing primary auditory cortical responses, STRFs of non-primary auditory neurons can be quite intricate, reflecting their mixed selectivity.
View Article and Find Full Text PDFLoss values of style transfer from UBM to AS-OCT images for plateau iris classification.
Sci Rep
December 2024
Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, Thailand.
Ultrasound biomicroscopy (UBM) is the standard for diagnosing plateau iris, but its limited accessibility in routine clinical settings presents challenges. While anterior segment optical coherence tomography (AS-OCT) is more convenient, its effectiveness in detecting plateau iris is limited. Previous research has demonstrated that combining UBM and AS-OCT image pairs through neural style transfer has improved classification accuracy.
View Article and Find Full Text PDFA general analogy mass-spring system analytical model for sound reduction of side-branch resonators.
J Acoust Soc Am
December 2024
Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey 08854, USA.
This study introduces a general analytical model designed to predict the sound reduction frequency of side-branch resonators, regardless of their geometric shapes. Grounded in a continuous analogy mass-spring system, we conceptualize the air within the branch cavity of the resonator as a series of infinitesimal continuous air layers. Each air layer is represented as a mass-spring unit, influenced by the pressure distribution inside the branch cavity.
View Article and Find Full Text PDFParallel mechanical computing: Metamaterials that can multitask.
Proc Natl Acad Sci U S A
December 2024
Department of Mechanical and Aerospace Engineering, University at Buffalo (State University of New York), Buffalo, NY 14260-4400.
Decades after being replaced with digital platforms, analogue computing has experienced a surging interest following developments in metamaterials and intricate fabrication techniques. Specifically, wave-based analogue computers which impart spatial transformations on an incident wavefront, commensurate with a desired mathematical operation, have gained traction owing to their ability to directly encode the input in its unprocessed form, bypassing analogue-to-digital conversion. While promising, these systems are inherently limited to single-task configurations.
View Article and Find Full Text PDFUltra-sparse reconstruction for photoacoustic tomography: Sinogram domain prior-guided method exploiting enhanced score-based diffusion model.
Photoacoustics
February 2025
School of Information Engineering, Nanchang University, Nanchang 330031, China.
Photoacoustic tomography, a novel non-invasive imaging modality, combines the principles of optical and acoustic imaging for use in biomedical applications. In scenarios where photoacoustic signal acquisition is insufficient due to sparse-view sampling, conventional direct reconstruction methods significantly degrade image resolution and generate numerous artifacts. To mitigate these constraints, a novel sinogram-domain priors guided extremely sparse-view reconstruction method for photoacoustic tomography boosted by enhanced diffusion model is proposed.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!