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    Three-dimensional acoustic double-zero-index medium with a Dirac-like point

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    Type
    Preprint
    Authors
    Xu, Changqing cc
    Ma, Guancong
    Chen, Zeguo cc
    Luo, Jie
    Shi, Jinjie
    Lai, Yun
    Wu, Ying cc
    KAUST Department
    Applied Mathematics and Computational Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Waves in Complex Media Research Group
    KAUST Grant Number
    BAS/1/1626-01-01
    OSR-2016-CRG5-2950
    Date
    2019-01-25
    Permanent link to this record
    http://hdl.handle.net/10754/661461
    
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    Abstract
    We report a design and experimental realization of a three-dimensional (3D) acoustic double-zero-index medium (DZIM), whose effective mass density and compressibility are nearly zero simultaneously. The DZIM is constructed from a cubic lattice of three orthogonally-aligned metal rods in air. The combination of lattice symmetry and accidental degeneracy yields a four-fold degenerate point with conical dispersion at the Brillouin zone center, where the material becomes a 3D DZIM. Though occupying a finite volume, the 3D DZIM maintains the wave properties of a "void space," and enables rich applications. For demonstration, we fabricate an acoustic "periscope" by placing the designed 3D DZIM inside a 3D bending waveguide, and observe the unusual wave tunneling effect through this waveguide with undisturbed planar wavefront. Our findings establish a practical route to realize 3D DZIM as an effective acoustic "void space," which offers unprecedented opportunities for advanced sound manipulation.
    Sponsors
    The work described in here is partially supported by King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2016-CRG5-2950 and KAUST Baseline Research Fund BAS/1/1626-01-01. G. M. is supported by the Hong Kong Research Grants Council (grant no. RGC-ECS 22302718, and ANR-RGC A-HKUST601/18, CRF C6013-18GF), the National Natural Science Foundation of China (grant no. 11802256), and by the Hong Kong Baptist University through FRG2/17-18/056. Y. L. is supported by National Key R&D Program of China (2017YFA0303702), National Natural Science Foundation of China (Grant No. 61671314 and No. 11634005).
    Publisher
    arXiv
    arXiv
    1901.08830
    Additional Links
    https://arxiv.org/pdf/1901.08830
    Collections
    Preprints; Applied Mathematics and Computational Science Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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