Over the recent decade, topological insulators, originating from the condensed matter physics, have resided at the frontier in the field of acoustics owing to their novel topological properties for manipulating robust wave propagation, which have also opened an intriguing landscape for potential applications. At the meantime, gradually slowing down acoustic waves with metamaterials allows temporary storage of sound, leading to the exploration of so-called trapped rainbow. However, most of the current studies are reported in a topological trivial context with complex structures, and it is hitherto still a challenge to obtain the high-efficient acoustic rainbow trapping effect in a straightforward setup. Here, we propose an acoustic gradient topological insulator in the one-dimensional system to realize a highly efficient rainbow trapping device. Based on the acoustic analogous Su–Schrieffer–Heeger model, we tune the eigenfrequencies of the topological interface states through modulating the neck widths of Helmholtz resonators. The experimentally measured pressure spectra clearly show that the proposed structure could tightly trap the broad-band sound waves at the target spatial positions. Our proposal may provide versatile possibilities for the design of topological acoustic devices.
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24 July 2023
Research Article|
July 24 2023
Rainbow trapping for sound waves in one-dimensional topological insulator
Special Collection:
Fundamentals and Applications of Metamaterials: Breaking the Limits
Chen Liu
;
Chen Liu
(Data curation, Investigation, Methodology, Visualization, Writing – original draft)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
2
Institute of Acoustics, School of Physics Science and Engineering, Tongji University
, Shanghai 200092, China
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Zhiwang Zhang
;
Zhiwang Zhang
a)
(Conceptualization, Funding acquisition, Investigation, Supervision, Validation, Visualization, Writing – review & editing)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
a)Authors to whom correspondence should be addressed: zhangzhiwang@nju.edu.cn; chengying@nju.edu.cn; and liuxiaojun@nju.edu.cn
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Danwei Liao
;
Danwei Liao
(Data curation, Methodology)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
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Zichong Yue;
Zichong Yue
(Data curation, Methodology)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
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Chengrong Ma;
Chengrong Ma
(Data curation, Investigation)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
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Ying Cheng
;
Ying Cheng
a)
(Funding acquisition, Supervision, Validation, Writing – review & editing)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
3
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences
, Beijing 100190, China
a)Authors to whom correspondence should be addressed: zhangzhiwang@nju.edu.cn; chengying@nju.edu.cn; and liuxiaojun@nju.edu.cn
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Xiaojun Liu
Xiaojun Liu
a)
(Funding acquisition, Supervision, Validation, Writing – review & editing)
1
Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
, Nanjing 210093, China
3
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences
, Beijing 100190, China
a)Authors to whom correspondence should be addressed: zhangzhiwang@nju.edu.cn; chengying@nju.edu.cn; and liuxiaojun@nju.edu.cn
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: zhangzhiwang@nju.edu.cn; chengying@nju.edu.cn; and liuxiaojun@nju.edu.cn
Appl. Phys. Lett. 123, 041701 (2023)
Article history
Received:
April 23 2023
Accepted:
July 06 2023
Citation
Chen Liu, Zhiwang Zhang, Danwei Liao, Zichong Yue, Chengrong Ma, Ying Cheng, Xiaojun Liu; Rainbow trapping for sound waves in one-dimensional topological insulator. Appl. Phys. Lett. 24 July 2023; 123 (4): 041701. https://doi.org/10.1063/5.0155714
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