Effective zero index in locally resonant acoustic material

Here in locally resonant acoustic material, it is shown that effective zero refractive index can be constructed by the resonant unit-cells with coherent degenerate monopole–dipole momenta. Due to strong local resonances, the material layers with effective zero refractive index can function as a reso...

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Bibliographic Details
Published in:Physics letters. A 2013-10, Vol.377 (31-33), p.1784-1787
Main Author: Zhu, Xue-Feng
Format: Article
Language:English
Subjects:
Acoustics
Deviation
High Q resonant cavity
Holes
Locally resonant acoustic material
Q factors
Reflection
Refractive index
Refractivity
Solid state physics
Zero refractive index
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Summary:Here in locally resonant acoustic material, it is shown that effective zero refractive index can be constructed by the resonant unit-cells with coherent degenerate monopole–dipole momenta. Due to strong local resonances, the material layers with effective zero refractive index can function as a resonant cavity of high Q factor, where a subtle deviation from the resonant frequency may result in distinct increase of reflection. Full-wave simulations are performed to demonstrate some unusual wave transport properties such as invisibility cloaking, super-reflection, local field enhancement, and wavefronts rotation. •Effective zero refractive index can be constructed by the resonant unit-cells.•Layers with zero refractive index can function as a high Q cavity.•Cloaking and super-reflection are numerically demonstrated.•Local enhancement and wavefronts rotation are numerically demonstrated.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2013.05.038