An acoustic bending waveguide designed by anisotropic density-near-zero metamaterial  

作　　者：王洋洋 丁二亮 刘晓宙 龚秀芬 

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

出　　处：《Chinese Physics B》2016年第12期32-35,共4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(Grant No.11474160);the Fundamental Research Funds for the Central Universities,China(Grant No.020414380001);the State Key Laboratory of Acoustics,Chinese Academy of Sciences(Grant No.SKLA201609);the Priority Academic Program Development of Jiangsu Higher Education Institution,China

摘　　要：Anisotropic metamaterial with only one component of the mass density tensor near zero （ADNZ） is proposed to control the sound wave propagation. We find that such an anisotropic metamaterial can be used to realize perfect bending waveguides. According to a coordinate transformation, the surface waves on the input and output interfaces of the ADNZ metamaterial induces the sound energy flow to be redistributed and match smoothly with the propagating modes inside the metamaterial waveguide. According to the theory of bending waveguide, we realize the ＂T＂-type sound shunting and convergence, as well as acoustic channel selection by embedding small-sized defects. Numerical calculations are performed to confirm the above effects.Anisotropic metamaterial with only one component of the mass density tensor near zero （ADNZ） is proposed to control the sound wave propagation. We find that such an anisotropic metamaterial can be used to realize perfect bending waveguides. According to a coordinate transformation, the surface waves on the input and output interfaces of the ADNZ metamaterial induces the sound energy flow to be redistributed and match smoothly with the propagating modes inside the metamaterial waveguide. According to the theory of bending waveguide, we realize the ＂T＂-type sound shunting and convergence, as well as acoustic channel selection by embedding small-sized defects. Numerical calculations are performed to confirm the above effects.

关 键 词：acoustic bending waveguide anisotropic metamaterials mass density tensor near zero 

分 类 号：TB34[一般工业技术—材料科学与工程]