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Special Issue:
Virtual Special Topic — Acoustics
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| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Tunable acoustic radiation pattern assisted by effective impedance boundary |
| Feng Qian(钱 枫)1,2, Li Quan(全力)1,3, Li-Wei Wang(王力维)1, Xiao-Zhou Liu (刘晓宙)1, Xiu-Fen Gong(龚秀芬)1 |
1. Key Laboratory of Modern Acoustics, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
2. College of Physics & Electronic Engineering, Changshu Institute of Technology, Changshu 215500, China;
3. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78713, USA |
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Abstract The acoustic wave propagation from a two-dimensional subwavelength slit surrounded by metal plates decorated with Helmholtz resonators (HRs) is investigated both numerically and experimentally in this work. Owing to the presence of HRs, the effective impedance of metal surface boundary can be manipulated. By optimizing the distribution of HRs, the asymmetric effective impedance boundary will be obtained, which contributes to generating tunable acoustic radiation pattern such as directional acoustic beaming. These dipole-like radiation patterns have high radiation efficiency, no fingerprint of sidelobes, and a wide tunable range of the radiation pattern directivity angle which can be steered by the spatial displacements of HRs.
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Received: 20 July 2015
Revised: 27 August 2015
Accepted manuscript online:
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PACS:
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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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46.40.-f
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(Vibrations and mechanical waves)
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| Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921504 and 2011CB707902), the National Natural Science Foundation of China (Grant No.11474160), the Fundamental Research Funds for Central Universities, China (Grant No. 020414380001), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLOA201401), the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry. |
Corresponding Authors:
Xiao-Zhou Liu
E-mail: xzliu@nju.edu.cn
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Cite this article:
Feng Qian(钱 枫), Li Quan(全力), Li-Wei Wang(王力维), Xiao-Zhou Liu (刘晓宙), Xiu-Fen Gong(龚秀芬) Tunable acoustic radiation pattern assisted by effective impedance boundary 2016 Chin. Phys. B 25 024301
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