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Chin. Phys. B, 2016, Vol. 25(12): 124305    DOI: 10.1088/1674-1056/25/12/124305
SPECIAL TOPIC—Acoustics Prev   Next  

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

Yang-Yang Wang(王洋洋)1, Er-Liang Ding(丁二亮)1, Xiao-Zhou Liu(刘晓宙)1,2, Xiu-Fen Gong(龚秀芬)1
1. Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China;
2. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China

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.

Keywords:  acoustic bending waveguide      anisotropic metamaterials      mass density tensor near zero  
Received:  08 March 2016      Revised:  24 May 2016      Accepted manuscript online: 
PACS:  43.20.+g (General linear acoustics)  
  43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound)  
  46.40.-f (Vibrations and mechanical waves)  

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), and the Priority Academic Program Development of Jiangsu Higher Education Institution, China.

Corresponding Authors:  Xiao-Zhou Liu     E-mail:

Cite this article: 

Yang-Yang Wang(王洋洋), Er-Liang Ding(丁二亮), Xiao-Zhou Liu(刘晓宙), Xiu-Fen Gong(龚秀芬) An acoustic bending waveguide designed by anisotropic density-near-zero metamaterial 2016 Chin. Phys. B 25 124305

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