Manipulation of extraordinary acoustic transmission by a tunable bull's eye structure  

作　　者：王继伟 程营 刘晓峻 

机构地区：[1]Key Laboratory of Modern Acoustics,Nanjing University [2]State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2014年第5期27-31,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2012CB921504);the National Natural Science Foundation of China(GrantNos.11104139,11274171,11274099,and 11204145);SRFDP(Grant Nos.20110091120040,20120091110001,and 20130091130004);the NaturalScience Foundation of Jiangsu Province,China(Grant No.BK2011542)

摘　　要：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.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.

关 键 词：extraordinary acoustic transmission acoustic grating transmission modulation sound collimation 

分 类 号：O422[理学—声学]