All-angle unidirectional flat-band acoustic metasurfaces
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 spec...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-55937-4 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Chenglin Han |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-99acb7c5fb7c40c7a2a6e43325d7e465 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-99acb7c5fb7c40c7a2a6e43325d7e4652025-01-19T12:32:14ZengNature PortfolioNature Communications2041-17232025-01-011611710.1038/s41467-025-55937-4All-angle unidirectional flat-band acoustic metasurfacesChenglin Han0Shida Fan1Hong-Tao Zhou2Kuan He3Yurou Jia4Changyou Li5Hongzhu Li6Xiao-Dong Yang7Li-Qun Chen8Tianzhi Yang9Cheng-Wei Qiu10School of Mechanical Engineering and Automation, Northeastern UniversitySchool of Mechanical Engineering and Automation, Northeastern UniversityDepartment of Electrical and Computer Engineering, National University of SingaporeSchool of Mechanical Engineering and Automation, Northeastern UniversityDepartment of Electrical and Computer Engineering, National University of SingaporeSchool of Mechanical Engineering and Automation, Northeastern UniversityDepartment of Mechanics, School of Mechanical Engineering, Tianjin UniversitySchool of Aerospace Engineering, Shenyang Aerospace UniversitySchool of Science, Harbin Institute of TechnologySchool of Mechanical Engineering and Automation, Northeastern UniversityDepartment of Electrical and Computer Engineering, National University of SingaporeAbstract 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.https://doi.org/10.1038/s41467-025-55937-4 |
| spellingShingle | 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 All-angle unidirectional flat-band acoustic metasurfaces Nature Communications |
| title | All-angle unidirectional flat-band acoustic metasurfaces |
| title_full | All-angle unidirectional flat-band acoustic metasurfaces |
| title_fullStr | All-angle unidirectional flat-band acoustic metasurfaces |
| title_full_unstemmed | All-angle unidirectional flat-band acoustic metasurfaces |
| title_short | All-angle unidirectional flat-band acoustic metasurfaces |
| title_sort | all angle unidirectional flat band acoustic metasurfaces |
| url | https://doi.org/10.1038/s41467-025-55937-4 |
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