| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Sound-transparent anisotropic media for backscattering-immune wave manipulation |
| Wei-Wei Kan(阚威威)†, Qiu-Yu Li(李秋雨), and Lei Pan(潘蕾) |
| School of Science, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract The scattering behavior of an anisotropic acoustic medium is analyzed to reveal the possibility of routing acoustic signals through the anisotropic layers with no backscattering loss. The sound-transparent effect of such a medium is achieved by independently modulating the anisotropic effective acoustic parameters in a specific order, and is experimentally observed in a bending waveguide by arranging the subwavelength structures in the bending part according to transformation acoustics. With the properly designed filling structures, the original distorted acoustic field in the bending waveguide is restored as if the wave travels along a straight path. The transmitted acoustic signal is maintained nearly the same as the incident modulated Gaussian pulse. The proposed schemes and the supporting results could be instructive for further acoustic manipulations such as wave steering, cloaking and beam splitting.
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Received: 04 November 2021
Revised: 26 December 2021
Accepted manuscript online: 07 January 2022
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PACS:
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43.20.-f
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(General linear acoustics)
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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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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974186, 11604153, and 61975080), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20160818 and BK20200070), and the Open Research Foundation of Key Laboratory of Modern Acoustics, Ministry of Education. |
Corresponding Authors:
Wei-Wei Kan
E-mail: kan@njust.edu.cn
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Cite this article:
Wei-Wei Kan(阚威威), Qiu-Yu Li(李秋雨), and Lei Pan(潘蕾) Sound-transparent anisotropic media for backscattering-immune wave manipulation 2022 Chin. Phys. B 31 084302
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