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Manipulation of extraordinary acoustic transmission by a tunable bull’s eye structure |
Wang Ji-Wei (王继伟)a, Cheng Ying (程营)a b, Liu Xiao-Jun (刘晓峻)a b |
a Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China;
b State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Extraordinary acoustic transmission (EAT) has been investigated in a tunable bull's eye structure. We demonstrate that the transmission coefficient of acoustic waves can be modulated by a grating structure. When the grating is located at a distance of 0.5 mm from the base plate, the acoustic transmission shows an 8.77-fold enhancement compared to that by using a traditional bull's eye structure. When the distance increases to 1.5 mm, the transmission approaches zero, indicating a total reflection. Thus, we can make an efficient modulation of acoustic transmission from 0 to 877%. The EAT effects have been ascribed to the coupling of structure-induced resonance with the diffractive wave and the waveguide modes, as well as the Fabry-Perot resonances. As a potential application, the modulation of far-field collimation is illustrated in the proposed bull's eye structure.
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Received: 01 November 2013
Revised: 02 December 2013
Accepted manuscript online:
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PACS:
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43.20.Fn
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(Scattering of acoustic waves)
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43.20.El
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(Reflection, refraction, diffraction of acoustic waves)
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43.20.Ks
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(Standing waves, resonance, normal modes)
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43.35.-c
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921504), the National Natural Science Foundation of China (Grant Nos. 11104139, 11274171, 11274099, and 11204145), SRFDP (Grant Nos. 20110091120040, 20120091110001, and 20130091130004), and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2011542). |
Corresponding Authors:
Cheng Ying, Liu Xiao-Jun
E-mail: chengying@nju.edu.cn;liuxiaojun@nju.edu.cn
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About author: 43.20.Fn; 43.20.El; 43.20.Ks; 43.35.-c |
Cite this article:
Wang Ji-Wei (王继伟), Cheng Ying (程营), Liu Xiao-Jun (刘晓峻) Manipulation of extraordinary acoustic transmission by a tunable bull’s eye structure 2014 Chin. Phys. B 23 054301
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