Enhancement of sound in chirped sonic crystals
Abstract
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- March 2013
- DOI:
- 10.1063/1.4793575
- arXiv:
- arXiv:1211.4199
- Bibcode:
- 2013ApPhL.102i1906R
- Keywords:
-
- acoustic wave propagation;
- acoustic wave reflection;
- 43.20.El;
- 43.20.Gp;
- Reflection refraction diffraction of acoustic waves;
- Reflection refraction diffraction interference and scattering of elastic and poroelastic waves;
- Condensed Matter - Materials Science
- E-Print:
- doi:10.1063/1.4793575