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All-angle unidirectional flat-band acoustic metasurfaces

Author

Listed:
  • Chenglin Han

    (Northeastern University
    Northeastern University
    National University of Singapore
    Northeastern University)

  • Shida Fan

    (Northeastern University)

  • Hong-Tao Zhou

    (National University of Singapore
    Tianjin University)

  • Kuan He

    (Northeastern University)

  • Yurou Jia

    (National University of Singapore
    Nanjing University)

  • Changyou Li

    (Northeastern University)

  • Hongzhu Li

    (Tianjin University)

  • Xiao-Dong Yang

    (Shenyang Aerospace University
    Beijing University of Technology)

  • Li-Qun Chen

    (Harbin Institute of Technology)

  • Tianzhi Yang

    (Northeastern University
    Northeastern University
    Northeastern University)

  • Cheng-Wei Qiu

    (National University of Singapore)

Abstract

Flat bands have empowered novel phenomena such as robust canalization with strong localization, high-collimation and low-loss propagation. However, the spatial symmetry protection in photonic or acoustic lattices naturally forces flat bands to manifest in pairs aligned at an inherently specific angle, resulting in a fixed bidirectional canalization. Here, we report an acoustic flat-band metasurface, allowing not only unidirectional canalization at all in-plane angles but also robust tunability in band alignment. The twist, tilt, and skew angles of the bilayer metasurface can be flexibly controlled to break both in-plane and out-of-plane spatial symmetries. These features can thereby turn arbitrary twist angles between bilayers into ‘magic angles’, while maintaining all unidirectional canalization and band alignment tunability. This work may significantly contribute to pushing twisted moiré physics into higher dimensions and facilitate the application of advanced acoustic or optical devices.

Suggested Citation

  • Chenglin Han & Shida Fan & Hong-Tao Zhou & Kuan He & Yurou Jia & Changyou Li & Hongzhu Li & Xiao-Dong Yang & Li-Qun Chen & Tianzhi Yang & Cheng-Wei Qiu, 2025. "All-angle unidirectional flat-band acoustic metasurfaces," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-55937-4
    DOI: 10.1038/s41467-025-55937-4
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