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Showing 1–17 of 17 results
Advanced filters: Author: Steven A. Cummer 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

  • The authors present a valley-Hall topological acoustofluidic chip revealing the complex interactions between elastic valley spin and nonlinear fluid dynamics, revealing its potential towards on-chip biological applications.

    • Shuaiguo Zhao
    • Zhenhua Tian
    • Tony Jun Huang
    ResearchOpen Access
    Nature Materials
    Volume: 24, P: 707-715

  • Gigantic jets, lightning discharges originating from tropical thunderstorms that can reach the base of the ionosphere at 90 km altitude, have not been captured using high-speed video cameras before. Here, the first such images are reported, showing a step-wise evolution of gigantic jets during their rising phase.

    • Oscar A. van der Velde
    • Joan Montanyà
    • Steven A. Cummer
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-10

  • 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

  • Gigantic jets emerge from the top of thunderstorms and extend all the way to the ionosphere at altitudes of 90 km. Simultaneous video images and magnetic field measurements of a gigantic jet demonstrate an electric charge transfer between the thunderstorm and the ionosphere that is comparable to that observed in cloud-to-ground lightning.

    • Steven A. Cummer
    • Jingbo Li
    • Thomas E. Nelson
    Research
    Nature Geoscience
    Volume: 2, P: 617-620

  • 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

  • Phase gradient metagratings suffer from limits on conversion efficiency. Here, the authors show a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range and uncover how integer parity plays a role in higher order diffraction.

    • Yangyang Fu
    • Chen Shen
    • Yadong Xu
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8

  • The valley degree of freedom gives additional flexibility to tunable phononic and photonic crystals. Here, the authors realise a honeycomb phononic structure where both the size of the cavities and of the air channel can be actively tuned, allowing several functionalities in a broad frequency range.

    • Zhenhua Tian
    • Chen Shen
    • Tony Jun Huang
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-10

  • Acoustic bianisotropy does not exist in natural materials but can be designed with acoustic metamaterials. Here, Li et al. utilized acoustic bianisotropy and develop a practical metamaterial with improved transmission efficiency which outperforms the Generalized Snell’s Law.

    • Junfei Li
    • Chen Shen
    • Steven A. Cummer
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-9

  • Upward electrical discharges from thunderstorms were discovered recently, and only a very limited set of observations exist because they are rare and unpredictable. Here, the authors present recordings of different types of the discharge above a storm, which contradict current theories of their origins.

    • Ningyu Liu
    • Nicholas Spiva
    • Steven A. Cummer
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-8

  • Acoustic metamaterials can be used manipulate sound waves with a high degree of control. Their applications include acoustic imaging and cloaking. This Review outlines the designs and properties of these materials, discussing transformation acoustics theory, anisotropic materials and active acoustic metamaterials.

    • Steven A. Cummer
    • Johan Christensen
    • Andrea Alù
    Reviews
    Nature Reviews Materials
    Volume: 1, P: 1-13

  • Although acoustic and optical tweezers are widely used, it is challenging to create a 3D trap with a simple set-up. Here, acoustic vortex streaming is combined with radiation force to realise 3D trapping of particles in a fluid.

    • Junfei Li
    • Alexandru Crivoi
    • Steven A. Cummer
    ResearchOpen Access
    Communications Physics
    Volume: 4, P: 1-8

  • Bound states in the continuum (BICs) emerge in cavities with a theoretically infinite quality factor, but the experimental measurement of such modes is challenging as they are not accessible from external perturbations. The Draft approved authors realize a fully open acoustic resonator supporting BICs, that allows for the direct measurement of the in-cavity field.

    • Marc Martí-Sabaté
    • Junfei Li
    • Dani Torrent
    ResearchOpen Access
    Communications Physics
    Volume: 7, P: 1-8