Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 17, Pages 5131-5138Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc01243e
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [51705395]
- China Postdoctoral Science Foundation [2018T111042, 2017M610632]
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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. The diffraction limit originates from the interference between converging and diverging waves, however, in this paper, a focus spot beyond the diffraction limit is realized by employing a point-like sink at the focus point to change this interference, thereby eliminating or reducing the diverging waves, using subwavelength coiled acoustic metamaterial absorbers. This sub-diffraction focusing effect is intuitively demonstrated in a number of three-dimensional time-reversal acoustic experiments, for which a planar coiled structure and two types of hemispherical coiled structures were respectively designed. Here, these linear, planar and spherical sub-diffraction focusing results are detailed and the corresponding physical mechanisms are discussed.
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