Unidirectional acoustic transmission in asymmetric bull’s eye structure
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- 作者：JiWei Wang ; BaoGuo Yuan ; Ying Cheng…
- 关键词：unidirectional acoustic transmission ; bull’s eye structure ; coherent diffraction ; 024302
- 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：58
- 期：2
- 页码：1-5
- 全文大小：863 KB
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- 刊物主题：Physics
Chinese Library of Science
Mechanics, Fluids and Thermodynamics
Physics - 出版者：Science China Press, co-published with Springer
- ISSN：1869-1927
文摘
Unidirectional acoustic transmission has been investigated in an asymmetric bull’s eye structure, which consistes of a sub-wavelength hole with concentric grooves on one side of a thin steel plate. When acoustic waves impinge normally on the groove side of the asymmetric structure, a strong acoustic transmitted energy flux is observed in the frequency range of 400-50 kHz, while there is no obvious transmitted energy flux in the same frequency range if the acoustic waves impinge normally on the other side. Thus, a remarkable unidirectional acoustic transmission behavior is exhibited by the current structure. With changing the period of the grooves, it is found that the transmitted acoustic energy flux keeps unchanged while the frequency of the transmitted waves can be modified. The experiments are performed, which has confirmed the unidirectional acoustic transmission behavior in the asymmetric bull’s eye structure. The asymmetric bull’s eye structure may have potential application in ultrasound diagnosis and therapy.