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Showing 1–7 of 7 results
Advanced filters: Author: Bogdan-Ioan Popa Clear advanced filters

  • Unidirectional acoustic devices only permit the flow of energy one way, but most implementations are large compared to acoustic frequencies. Popa and Cummer use a metamaterial approach to build such devices that are only a tenth of a wavelength thick but retain high acoustic isolation.

    • Bogdan-Ioan Popa
    • Steven A. Cummer
    Research
    Nature Communications
    Volume: 5, P: 1-5

  • Metasurfaces are subwavelength structures that manipulate impinging waves into desired output waveforms, but building them for acoustic applications remains challenging. Exploiting tapered labyrinthine structures, Xie et al.present an acoustic metasurface that manipulates sound waves in a variety of ways.

    • Yangbo Xie
    • Wenqi Wang
    • Steven A. Cummer
    Research
    Nature Communications
    Volume: 5, P: 1-5

  • Porous rubber microbeads suspended in a gel are found to exhibit a negative acoustic index of refraction, which makes these metamaterials promising for underwater acoustic applications.

    • Bogdan-Ioan Popa
    • Steven A. Cummer
    News & Views
    Nature Materials
    Volume: 14, P: 363-364

  • In addition to controlling the propagation of light, metamaterials have also received attention for controlling sound. Now, a device that can act as a broadband and omnidirectional acoustic cloak is experimentally demonstrated.

    • Lucian Zigoneanu
    • Bogdan-Ioan Popa
    • Steven A. Cummer
    Research
    Nature Materials
    Volume: 13, P: 352-355

  • Methods to silence broadband noise and shield large volumes are lacking. Here, the authors show theoretically and experimentally that acoustic bianisotropic materials, with non-zero strain to momentum coupling, lead to effective sound barriers with excellent efficiency in terms of attenuation, bandwidth, and shielded volume.

    • Bogdan-Ioan Popa
    • Yuxin Zhai
    • Hyung-Suk Kwon
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-7

  • Scattered elastic waves provide non-invasive diagnostics and dynamic characterization of metamaterials, but extracting information from small-size samples is challenging. Here, convolutional neural networks are used to interpret diffracted waves, revealing how sample-edge scattering provides the most significant information on macroscopic metamaterial properties.

    • Yuxin Zhai
    • Hyung-Suk Kwon
    • Bogdan-Ioan Popa
    ResearchOpen Access
    Communications Materials
    Volume: 3, P: 1-7