| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Unidirectional Negative Refraction at an Exceptional Point of Acoustic $PT$-Symmetric Systems |
| Chen Liu1,2, Jun Lan3, Zhongming Gu1*, and Jie Zhu1* |
1Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
3College of Computer Science and Technology, Nanjing Tech University, Nanjing 211800, China
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| Cite this article: |
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Chen Liu, Jun Lan, Zhongming Gu et al 2023 Chin. Phys. Lett. 40 124301 |
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Abstract We demonstrate a method to realize unidirectional negative refraction in an acoustic parity-time ($PT$)-symmetric system, which is composed of a pair of metasurfaces sandwiching an air gap. The pair of metasurfaces possesses loss and gain modulations. The unidirectional negative refraction, which is strictly limited to the case of incident wave imposing on the loss end of the metasurface, is demonstrated at the exception point (EP) in this $PT$-symmetric system, while the incidence from the other side leads to strong reflection. Based on rigorous calculations, we explicitly show the underlying mechanism of this model to achieve unidirectional wave scatterings around the EP in the parametric space. In addition, the perfect imaging of a point source in the three-dimensional space, as a signature of negative refraction, is simulated to provide a verification of our work. We envision that this work may sharpen the understanding of $PT$-symmetric structures and inspire more acoustic functional devices.
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Received: 07 September 2023
Published: 23 November 2023
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.20.El
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(Reflection, refraction, diffraction of acoustic waves)
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43.20.Fn
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(Scattering of acoustic waves)
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