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    A perfect Fresnel acoustic reflector implemented by a Fano-resonant metascreen

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    Type
    Article
    Authors
    Amin, M.
    Siddiqui, O.
    Farhat, Mohamed
    Khelif, A.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2018-04-10
    Online Publication Date
    2018-04-10
    Print Publication Date
    2018-04-14
    Permanent link to this record
    http://hdl.handle.net/10754/627487
    
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    Abstract
    We propose a perfectly reflecting acoustic metasurface which is designed by replacing the curved segments of the traditional Fresnel reflector by flat Fano-resonant sub-wavelength unit cells. To preserve the original Fresnel focusing mechanism, the unit cell phase follows a specific phase profile which is obtained by applying the generalized Snell's law and Fermat's principle. The reflected curved phase fronts are thus created at the air-metasurface boundary by tailoring the metasurface dispersion as dictated by Huygens' principle. Since the unit cells are implemented by sub-wavelength double slit-shaped cavity resonators, the impinging sound waves are perfectly reflected producing acoustic focusing with negligible absorption. We use plane-wave solution and full-wave simulations to demonstrate the focusing effects. The simulation results closely follow the analytical predictions.
    Citation
    Amin M, Siddiqui O, Farhat M, Khelif A (2018) A perfect Fresnel acoustic reflector implemented by a Fano-resonant metascreen. Journal of Applied Physics 123: 144502. Available: http://dx.doi.org/10.1063/1.5012012.
    Publisher
    AIP Publishing
    Journal
    Journal of Applied Physics
    DOI
    10.1063/1.5012012
    Additional Links
    https://aip.scitation.org/doi/10.1063/1.5012012
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5012012
    Scopus Count
    Collections
    Articles; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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