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    Flat acoustic lens by acoustic grating with curled slits

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    Type
    Article
    Authors
    Peng, Pai
    Xiao, Bingmu
    Wu, Ying cc
    KAUST Department
    Applied Mathematics and Computational Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Earth Science and Engineering Program
    Graduate Affairs Operations
    Waves in Complex Media Research Group
    Date
    2014-10
    Permanent link to this record
    http://hdl.handle.net/10754/563781
    
    Metadata
    Show full item record
    Abstract
    We design a flat sub-wavelength lens that can focus acoustic wave. We analytically study the transmission through an acoustic grating with curled slits, which can serve as a material with tunable impedance and refractive index for acoustic waves. The effective parameters rely on the geometry of the slits and are independent of frequency. A flat acoustic focusing lens by such acoustic grating with gradient effective refractive index is designed. The focusing effect is clearly observed in simulations and well predicted by the theory. We demonstrate that despite the large impedance mismatch between the acoustic lens and the matrix, the intensity at the focal point is still high due to Fabry-Perot resonance.
    Citation
    Peng, P., Xiao, B., & Wu, Y. (2014). Flat acoustic lens by acoustic grating with curled slits. Physics Letters A, 378(45), 3389–3392. doi:10.1016/j.physleta.2014.09.042
    Sponsors
    This work was supported by the Baseline Research Fund of King Abdullah University of Science and Technology.
    Publisher
    Elsevier BV
    Journal
    Physics Letters A
    DOI
    10.1016/j.physleta.2014.09.042
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.physleta.2014.09.042
    Scopus Count
    Collections
    Articles; Applied Mathematics and Computational Science Program; Earth Science and Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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