Abstract

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 \[{P}_{m\bar{3}m}\]. 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.

Details

Title
Dimensional hierarchy of higher-order topology in three-dimensional sonic crystals
Author
Zhang, Xiujuan 1 ; Bi-Ye, Xie 1 ; Hong-Fei, Wang 1 ; Xu, Xiangyuan 2 ; Tian, Yuan 1 ; Jian-Hua, Jiang 3 ; Ming-Hui, Lu 4   VIAFID ORCID Logo  ; Yan-Feng, Chen 5 

1  National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, China 
2  National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, China; Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China 
3  School of Physical Science and Technology, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, China 
4  National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, China; Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China 
5  National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China 
Pages
1-10
Publication year
2019
Publication date
Nov 2019
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41467-019-13333-9
ProQuest document ID
2317926273
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.