期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 136, 期 2, 页码 EL192-EL198出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4890942
关键词
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资金
- Swiss National Science Foundation
Deep sub-wavelength focusing has been demonstrated for locally resonant metamaterials using electromagnetic and acoustic waves. The elastic equivalents of such objects are made of sub-wavelength resonating beams fixed to a two-dimensional plate, as presented here. Independent of a random or regular arrangement of the resonators, the metamaterial shows large bandgaps that are independent of the incident wave direction. Numerical simulations demonstrate that the insertion of a defect in the layout, as a shorter resonator, creates strong amplification of the wave-field on the defect. This energy trapping, which is localized on a spatial scale that is much smaller than the wavelength in the two-dimensional plate, leads to a >1 factor in terms of the local density of energy. (C) 2014 Acoustical Society of America
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