| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Experimental realization of fractal fretwork metasurface for sound anomalous modulation |
| Jiajie He(何佳杰)1, Shumeng Yu(于书萌)1, Xue Jiang(江雪)1,†, and Dean Ta(他得安)1,2,‡ |
1 Department of Biomedical Engineering, School of Information Science and Technology, Fudan University, Shanghai 200433, China;
2 Academy for Engineering and Technology, Fudan University, Shanghai 200433, China |
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Abstract Natural creatures and ancient cultures are full of potential sources to provide inspiration for applied sciences. Inspired by the fractal geometry in nature and the fretwork frame in ancient culture, here we design the acoustic metasurface to realize sound anomalous modulation, which manifests itself as an incident-dependent propagation behavior: sound wave propagating in the forward direction is allowed to transmit with high efficiency while in the backward direction is obviously suppressed. We quantitatively investigate the dependences of asymmetric transmission on the propagation direction, incident angle and operating frequency by calculating sound transmittance and energy contrast. This compact fractal fretwork metasurface for acoustic anomalous modulation would promote the development of integrated acoustic devices and expand versatile applications in acoustic communication and information encryption.
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Received: 15 January 2024
Revised: 24 February 2024
Accepted manuscript online: 28 February 2024
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PACS:
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43.20.+g
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(General linear acoustics)
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43.28.+h
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(Aeroacoustics and atmospheric sound)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1404500), the National Natural Science Foundation of China (Grant Nos. T2222024 and 12034005), the STCSM Science and Technology Innovation Plan of Shanghai Science and Technology Commission (Grant Nos. 20ZR1404200 and 21JC1400300). |
Corresponding Authors:
Xue Jiang, Dean Ta
E-mail: xuejiang@fudan.edu.cn;tda@fudan.edu.cn
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Cite this article:
Jiajie He(何佳杰), Shumeng Yu(于书萌), Xue Jiang(江雪), and Dean Ta(他得安) Experimental realization of fractal fretwork metasurface for sound anomalous modulation 2024 Chin. Phys. B 33 054301
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