Dimensional hierarchy of higher-order topology in three-dimensional sonic crystals

Wave trapping and manipulation are at the heart of modern integrated photonics and acoustics. Grand challenges emerge on increasing the integration density and reducing the wave leakage/noises due to fabrication imperfections, especially for waveguides and cavities at subwavelength scales. The risin...

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Veröffentlicht in:Nature communications Jg. 10; H. 1; S. 5331 - 10
Hauptverfasser: Zhang, Xiujuan, Xie, Bi-Ye, Wang, Hong-Fei, Xu, Xiangyuan, Tian, Yuan, Jiang, Jian-Hua, Lu, Ming-Hui, Chen, Yan-Feng
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Nature Publishing Group UK 25.11.2019
Nature Publishing Group
Nature Portfolio
Schlagworte:
639/301/119/2792/4128
639/624/399/1015
Acoustic noise
Acoustics
Cavities
Crystals
Fabrication
Humanities and Social Sciences
Interfaces
multidisciplinary
Photonics
Science
Science (multidisciplinary)
Topology
Trapping
Waveguides
ISSN:2041-1723, 2041-1723
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Zusammenfassung:Wave trapping and manipulation are at the heart of modern integrated photonics and acoustics. Grand challenges emerge on increasing the integration density and reducing the wave leakage/noises due to fabrication imperfections, especially for waveguides and cavities at subwavelength scales. The rising of robust wave dynamics based on topological mechanisms offers possible solutions. Ideally, in a three-dimensional (3D) topological integrated chip, there are coexisting robust two-dimensional (2D) interfaces, one-dimensional (1D) waveguides and zero-dimensional (0D) cavities. Here, we report the experimental discovery of such a dimensional hierarchy of the topologically-protected 2D surface states, 1D hinge states and 0D corner states in a single 3D system. Such an unprecedented phenomenon is triggered by the higher-order topology in simple-cubic sonic crystals and protected by the space group P m 3 ¯ m . Our study opens up a new regime for multidimensional wave trapping and manipulation at subwavelength scales, which may inspire future technology for integrated acoustics and photonics. Here, the authors report the experimental discovery of such a dimensional hierarchy of the topologically-protected 2D surface states, 1D hinge states and 0D corner states in a single 3D acoustic system by using higher-order topological sonic crystals.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-13333-9