All-angle unidirectional flat-band acoustic metasurfaces

Chenglin Han, Shida Fan, Hong-Tao Zhou, Kuan He, Yurou Jia, Changyou Li, Hongzhu Li, Xiao-Dong Yang (), Li-Qun Chen, Tianzhi Yang () and Cheng-Wei Qiu ()
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Chenglin Han: Northeastern University
Shida Fan: Northeastern University
Hong-Tao Zhou: National University of Singapore
Kuan He: Northeastern University
Yurou Jia: National University of Singapore
Changyou Li: Northeastern University
Hongzhu Li: Tianjin University
Xiao-Dong Yang: Shenyang Aerospace University
Li-Qun Chen: Harbin Institute of Technology
Tianzhi Yang: Northeastern University
Cheng-Wei Qiu: National University of Singapore

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-55937-4

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