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Compact asymmetric sound absorber at the exceptional point

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Abstract

We present an asymmetric absorber at an exceptional point (EP) with a compact configuration and deep-subwavelength thickness. Unlike conventional side-branched sound absorbers in dual-port systems, the proposed asymmetric absorber exhibits a compact shape that is coaxial with the waveguide. By tuning the loss and geometric parameters of the non-Hermitian system to reach an EP, we observe extreme asymmetric absorption. This phenomenon is theoretically and experimentally validated by observing a quasi-perfect absorption and a near-total reflection for opposite incidences at the ultra-thin (1/28th of the operating wavelength) neck-embedded tube employed in this study. Furthermore, we demonstrate an EP-induced tunable asymmetric absorption. Our study proposes novel approaches to manipulate the EP-induced wave phenomena, paving the way for the development of novel acoustic absorbers, sensors, isolators, and directional devices.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China

    DongTing Li, SiBo Huang, Yi Cheng & Yong Li

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  1. DongTing Li
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  2. SiBo Huang
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  3. Yi Cheng
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  4. Yong Li
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Corresponding author

Correspondence to Yong Li.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 11704284), and the Young Elite Scientists Sponsorship by China Association for Science and Technology (CAST) (Grant No. 2018QNRC001).

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Li, D., Huang, S., Cheng, Y. et al. Compact asymmetric sound absorber at the exceptional point. Sci. China Phys. Mech. Astron. 64, 244303 (2021). https://doi.org/10.1007/s11433-020-1612-1

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