Acoustic phase-reconstruction near the Dirac point of a triangular phononic crystal

In this work, acoustic phase-reconstruction is studied and experimentally demonstrated in a triangular lattice two-dimensional phononic crystal (PnC) composed of steel rods in air. Owning to the fact that two bands of this triangular lattice PnC touch at the K/K′ point and thus give rise to a conica...

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Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (15)
Main Authors: Yu, Si-Yuan, Wang, Qing, Zheng, Li-Yang, He, Cheng, Liu, Xiao-Ping, Lu, Ming-Hui, Chen, Yan-Feng
Format: Article
Language:English
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Summary:In this work, acoustic phase-reconstruction is studied and experimentally demonstrated in a triangular lattice two-dimensional phononic crystal (PnC) composed of steel rods in air. Owning to the fact that two bands of this triangular lattice PnC touch at the K/K′ point and thus give rise to a conical Dirac cone, acoustic waves transmitting through this PnC can exhibit a pseudo-diffusion transportation feature, producing a reconstructed planar wavefront in the far field away from the interface of the PnC. Such phase reconstruction effect can be utilized in many applications, and here we demonstrate experimentally two important applications: an acoustic collimator and an acoustic cloak operating at a Dirac frequency of 41.3 kHz.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4918651