Observation of higher-order exceptional points in a non-local acoustic metagrating

Higher-order exceptional points have attracted increased attention in recent years due to their enhanced sensitivity and distinct topological features. Here, we show that non-local acoustic metagratings enabling precise and simultaneous control over their multiple orders of diffraction can serve as...

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Bibliographic Details
Published in:Communications physics 2021-12, Vol.4 (1), p.1-7, Article 271
Main Authors: Fang, Xinsheng, Gerard, Nikhil J R K, Zhou, Zhiling, Ding, Hua, Wang, Nengyin, Jia, Bin, Deng, Yuanchen, Wang, Xu, Jing, Yun, Li, Yong
Format: Article
Language:English
Subjects:
639/301/1023/303
639/766/25/3927
Acoustics
Diffraction
Eigenvalues
Eigenvectors
Physics
Physics and Astronomy
Robustness
Sensitivity enhancement
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Summary:Higher-order exceptional points have attracted increased attention in recent years due to their enhanced sensitivity and distinct topological features. Here, we show that non-local acoustic metagratings enabling precise and simultaneous control over their multiple orders of diffraction can serve as a robust platform for investigating higher-order exceptional points in free space. The proposed metagratings, not only could advance the fundamental research of arbitrary order exceptional points, but could also empower unconventional free-space wave manipulation for applications related to sensing and extremely asymmetrical wave control. Exceptional points are singularities in the parameter space of a physical system where two or more eigenvalues, and their associated eigenvectors, simultaneously coalesce. Here, it is shown that non-local acoustic metagratings that enable precise control over their multiple orders of diffraction, can serve as a robust platform for investigating higher-order exceptional points in free space.
ISSN:2399-3650
2399-3650
DOI:10.1038/s42005-021-00779-x