Enhanced scattering of acoustic waves at interfaces
Enhanced scattering of acoustic waves at interfaces
Li Zhao (赵瓅)1, Bin Liu (刘斌)1, Yin-hao Gao (高银浩)2, Yan-jiao Zhao (赵艳皎)3(), Ji-ping Huang (黄吉平)1()
1. Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China; 2. School of Machinery and Electricity, Henan Institute of Science and Technology, Xinxiang 453003, China; 3. Advanced Materials Laboratory, Fudan University, Shanghai 200438, China
We propose a general method to realize a total scattering of an incident acoustic wave at interfaces between different media while allowing the flow of air, fluids and/or particles. This originates from the enlargement of the equivalent acoustic scattering cross section of an embedded object coated with acoustic metamaterials, which causes the coated object to behave as a scatterer bigger than its physical size. We theoretically design a model circular cylindrical object coated with such metamaterials whose properties are determined according to two different, but identical, methods. The desired function is confirmed for both far-field and near-field cases with full wave simulations based on the finite element method. This work reveals a promising way to achieve noise shielding and naval camouflage.
J. B. Pendry, D. Schurig, and D. R. Smith, Science , 2006, 312(5781): 1780 doi: 10.1126/science.1125907
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D. Schurig, J. J. Mock, B. J. Justice, S. A. Cummer, J. B. Pendry, A. F. Starr, and D. R. Smith, Science , 2006, 314(5801): 977 doi: 10.1126/science.1133628
4
W. Cai, U. K. Chettiar, A. V. Kildishev, and V. M. Shalaev, Nat. Photonics , 2007, 1(4): 224 doi: 10.1038/nphoton.2007.28
5
X. F. Xu, Y. J. Feng, L. Zhao, T. Jiang, C. H. Lu, and Z. Z. Xu, J. Phys D , 2008, 41: 215504 doi: 10.1088/0022-3727/41/21/215504
