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22 April 2020 Three dimensional zero-index acoustic metamaterials (Conference Presentation)
Changqing Xu, Guancong Ma, Yun Lai, Ying Wu
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Proceedings Volume 11381, Health Monitoring of Structural and Biological Systems XIV; 113811B (2020) https://doi.org/10.1117/12.2558283
Event: SPIE Smart Structures + Nondestructive Evaluation, 2020, Online Only
Abstract
In this talk, I will present our practical design of a three-dimensional (3D) acoustic DZIM, which is made of a cubic lattice of metal rods. We demonstrate a four-fold degenerate point with conical dispersion can be induced at the Brillouin zone center, at which the effective mass density and compressibility simultaneously turning zero. To demonstrate the extraordinary functionalities of the DZIM, we have fabricated an acoustic "periscope" with two 90° turns to achieve almost perfect tunneling of a normally incident plane wave. The experimental results agree well with our theoretical predictions and numerical simulations.
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Changqing Xu, Guancong Ma, Yun Lai, and Ying Wu "Three dimensional zero-index acoustic metamaterials (Conference Presentation)", Proc. SPIE 11381, Health Monitoring of Structural and Biological Systems XIV, 113811B (22 April 2020); https://doi.org/10.1117/12.2558283
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KEYWORDS
Acoustics
Metamaterials
Waveguides
Dispersion
Metals
Numerical simulations
Planar waveguides
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