Experimental validation of systematically designed acoustic hyperbolic meta material slab exhibiting negative refraction

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    Abstract

    This Letter reports on the experimental validation of a two-dimensional acoustic hyperbolic metamaterial slab optimized to exhibit negative refractive behavior. The slab was designed using a topology optimization based systematic design method allowing for tailoring the refractive behavior. The experimental results confirm the predicted refractive capability as well as the predicted transmission at an interface. The study simultaneously provides an estimate of the attenuation inside the slab stemming from the boundary layer effects—insight which can be utilized in the further design of the metamaterial slabs. The capability of tailoring the refractive behavior opens possibilities for different applications. For instance, a slab exhibiting zero refraction across a wide angular range is capable of funneling acoustic energy through it, while a material exhibiting the negative refractive behavior across a wide angular range provides lensing and collimating capabilities.
    Original languageEnglish
    Article number101905
    JournalApplied Physics Letters
    Volume109
    Issue number10
    Number of pages5
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2016

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