金属圆柱结构中多焦点声聚焦效应
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- 英文论文题名：Multifocal acoustic focusing in metal cylinder structure
- 论文作者：夏建平 ; 施懿宸 ; 孙宏祥
- 英文论文作者：XIA Jian-ping ; SHI Yi-chen ; SUN Hong-xiang ; Faculty of Science ; Research Center of Fluid Machinery Engineering and Technology ; Jiangsu University
- 年：2016
- 作者机构：江苏大学理学院流体机械工程技术研究中心;
- 论文关键词：声聚焦 ; 多焦点 ; 纹影成像
- 英文论文关键词：acoustic focusing ; cylinder ; Schlieren imaging system
- 会议召开时间：2016-10-28
- 会议录名称：2016年全国声学学术会议论文集
- 语种：中文
- 分类号：O422
- 学会代码：OGSM
- 会议名称：2016年全国声学学术会议
- 会议地点：中国湖北武汉
- 主办单位：中国声学学会
- 学会名称：中国声学学会
- 页数：4
- 文件大小：547k
- 原文格式：D
- 会议级别：全国
摘要
我们分别在理论与实验上实现了浸没在水中金属圆柱结构的多焦点声聚焦效应。当入射平面声波从外侧激发金属圆柱时,可在金属圆柱内部聚焦成一个或多个焦点。该效应来源于金属圆柱的Mie共振模式,与负折射机制实现声聚焦效应不同,是一种全新的物理机制。基于严格声散射法理论计算得到的声压全场分布与纹影法实验测量的结果符合很好。
We report both experimentally and theoretically that a multifocal acoustic focusing lens is realized by a metal cylinder structure immersed in water. The acoustic waves can be focused on one or more points at the centre of the cylinder. This phenomenon arises from the Mie-resonance modes in the cylinder at many frequencies, which is essentially distinct from the previous studies originating from the negative refraction. The acoustic pressure fields measured in the Schlieren imaging system agree with the results calculated using the acoustic scattering theory.
We report both experimentally and theoretically that a multifocal acoustic focusing lens is realized by a metal cylinder structure immersed in water. The acoustic waves can be focused on one or more points at the centre of the cylinder. This phenomenon arises from the Mie-resonance modes in the cylinder at many frequencies, which is essentially distinct from the previous studies originating from the negative refraction. The acoustic pressure fields measured in the Schlieren imaging system agree with the results calculated using the acoustic scattering theory.
引文
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[2]Lee S H,Wright O B.Origin of negative density and modulus in acoustic metamaterials[J].Physical Review B,2016,93(2):024302.
[3]Deng K,Ding Y,He Z,et al.Graded negative index lens with designable focal length by phononic crystal[J].Journal of Physics D:Applied Physics,2009,42(18):185505.
[4]Lin S C S,Huang T J,Sun J H,et al.Gradient-index phononic crystals[J].Physical Review B,2009,79(9):094302.
[5]Climente A,Torrent D,Sánchez-Dehesa J.Sound focusing by gradient index sonic lenses[J].Applied Physics Letters,2010,97(10):104103.
[6]Torrent D,Sánchez-Dehesa J.Acoustic metamaterials for new two-dimensional sonic devices[J].New Journal of Physics,2007,9(9):323.
[7]Peng S,He Z,Jia H,et al.Acoustic far-field focusing effect for two-dimensional graded negative refractive-index sonic crystals[J].Applied Physics Letters,2010,96(26):263502.
[8]Zhang S,Yin L,Fang N.Focusing ultrasound with an acoustic metamaterial network[J].Physical Review Letters,2009,102(19):194301.
[9]Zigoneanu L,Popa B I,Cummer S A.Design and measurements of a broadband two-dimensional acoustic lens[J].Physical Review B,2011,84(2):024305.
[10]Li Y,Liang B,Tao X,Zhu X F,Zou X Y,Cheng J C.Acoustic focusing by coiling up space[J].Applied Physics Letters,2012,101(23):233508.
[11]Molerón M,Serra-Garcia M,Daraio C.Acoustic Fresnel lenses with extraordinary transmission[J].Applied Physics Letters,2014,105(11):114109.
[12]Wang W,Xie Y,Konneker A,Popa B I,Cummer S A.Design and demonstration of broadband thin planar diffractive acoustic lenses[J].Applied Physics Letters,2014,105(10):101904.
[13]Tian Y,Wei Q,Cheng Y,Xu Z,Liu X.Broadband manipulation of acoustic wavefronts by pentamode metasurface[J].Applied Physics Letters,2015,107(22):221906.
[14]Xia J P,Sun H X.Acoustic focusing by metal circular ring structure[J].Applied Physics Letters,2015,106(6):063505.
[15]Xia J P,Sun H X,Cheng Q,et al.Theoretical and experimental verification of acoustic focusing in metal cylinder structure[J].Applied Physics Express,2016,9(5):057301.
[16]Cheng Y,Liu X J.Extraordinary Resonant Scattering in Imperfect Acoustic Cloak[J].Chinese Physics Letters,2009,26(1):014301.
[17]Cheng Y,Zhou C,Yuan B G,Wu D J,Wei Q,Liu X J.Ultra-sparse metasurface for high reflection of low-frequency sound based on artificial Mie resonances[J].Nature Materials,2015,14(10):1013-1019.
[18]Unverzagt C,Olfert S,Henning B.A new method of spatial filtering for Schlieren visualization of ultrasound wave fields[J].Physics Procedia,2010,3(1):935-942.