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Three-dimensional acoustic sub-diffraction focusing by coiled metamaterials with strong absorption

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The diffraction limit restricts the smallest diameter of a wave's focal spot in a homogeneous medium to no less than half of the operating wavelength. Click to show full abstract

The diffraction limit restricts the smallest diameter of a wave's focal spot in a homogeneous medium to no less than half of the operating wavelength.

Keywords: acoustic sub; diffraction focusing; three dimensional; diffraction; sub diffraction; dimensional acoustic

Journal Title: Journal of Materials Chemistry C
Year Published: 2019

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