期刊
APPLIED PHYSICS LETTERS
卷 102, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4793575
关键词
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资金
- Spanish Ministry of Science and Innovation
- European Union [FIS2011-29734-C02-01, FIS2011-29734-C02-02, GVA/2011/055]
- UPV [CEI-01-11, PAID-02-01]
- ICREA Funding Source: Custom
We propose and experimentally demonstrate a mechanism of sound wave concentration based on soft reflections in chirped sonic crystals. The reported controlled field enhancement occurs at around particular (bright) planes in the crystal and is related to a progressive slowing down of the sound wave as it propagates along the material. At these bright planes, a substantial concentration of the energy (with a local increase up to 20 times) was obtained for a linear chirp and for frequencies around the first band gap. A simple couple mode theory is proposed that interprets and estimates the observed effects. Wave concentration energy can be applied to increase the efficiency of detectors and absorbers. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793575]
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