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• W2518472030 abstract "Artificially designed acoustic meta-surfaces have the ability to manipulate sound energy to an extraordinary extent. Here, we report on a new type of directional reflective surface consisting of an array of sub-wavelength Helmholtz resonators with varying internal coiled path lengths, which induce a reflection phase gradient along a planar acoustic meta-surface. The acoustically reshaped reflective surface created by the gradient-impeding meta-surface yields a distinct focal line similar to a parabolic cylinder antenna, and is used for directive sound beamforming. Focused beam steering can be also obtained by repositioning the source (or receiver) off axis, i.e., displaced from the focal line. Besides flat reflective surfaces, complex surfaces such as convex or conformal shapes may be used for sound beamforming, thus facilitating easy application in sound reinforcement systems. Therefore, directional reflective surfaces have promising applications in fields such as acoustic imaging, sonic weaponry, and underwater communication." @default.
• W2518472030 created "2016-09-16" @default.
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• W2518472030 date "2016-08-26" @default.
• W2518472030 modified "2023-10-07" @default.
• W2518472030 title "Directional Reflective Surface Formed via Gradient-Impeding Acoustic Meta-Surfaces" @default.
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• W2518472030 doi "https://doi.org/10.1038/srep32300" @default.
• W2518472030 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4999803" @default.
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