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Dark acoustic metamaterials as super absorbers for low-frequency sound

Author

Listed:
  • Jun Mei

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

  • Guancong Ma

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

  • Min Yang

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

  • Zhiyu Yang

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

  • Weijia Wen

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

  • Ping Sheng

    (Hong Kong University of Science and Technology, Clear Water Bay, Kowloon)

Abstract

The attenuation of low-frequency sound has been a challenging task because the intrinsic dissipation of materials is inherently weak in this regime. Here we present a thin-film acoustic metamaterial, comprising an elastic membrane decorated with asymmetric rigid platelets that aims to totally absorb low-frequency airborne sound at selective resonance frequencies ranging from 100–1,000 Hz. Our samples can reach almost unity absorption at frequencies where the relevant sound wavelength in air is three orders of magnitude larger than the membrane thickness. At resonances, the flapping motion of the rigid platelets leads naturally to large elastic curvature energy density at their perimeter regions. As the flapping motions couple only minimally to the radiation modes, the overall energy density in the membrane can be two-to-three orders of magnitude larger than the incident wave energy density at low frequencies, forming in essence an open cavity.

Suggested Citation

  • Jun Mei & Guancong Ma & Min Yang & Zhiyu Yang & Weijia Wen & Ping Sheng, 2012. "Dark acoustic metamaterials as super absorbers for low-frequency sound," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1758
    DOI: 10.1038/ncomms1758
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    Cited by:

    1. Stanislav Sergeev & Romain Fleury & Hervé Lissek, 2023. "Ultrabroadband sound control with deep-subwavelength plasmacoustic metalayers," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Giuseppe Ciaburro & Rosaria Parente & Gino Iannace & Virginia Puyana-Romero, 2022. "Design Optimization of Three-Layered Metamaterial Acoustic Absorbers Based on PVC Reused Membrane and Metal Washers," Sustainability, MDPI, vol. 14(7), pages 1-20, April.
    3. Anis Maddi & Come Olivier & Gaelle Poignand & Guillaume Penelet & Vincent Pagneux & Yves Aurégan, 2023. "Frozen sound: An ultra-low frequency and ultra-broadband non-reciprocal acoustic absorber," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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