Trapping and guiding of acoustic waves by defect modes in a full-band-gap ultrasonic crystal
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- 5 December 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 68 (21), 214301
- https://doi.org/10.1103/physrevb.68.214301
Abstract
We report on the experimental observation of the existence and the interaction of localized defect modes in a full acoustic band gap in a two-dimensional lattice of steel cylinders immersed in water. The confinement of defect modes and the splitting of their resonance frequencies are observed and are explained by their evanescent coupling. A different type of waveguiding in a phononic crystal based on the evanescent coupling of defect modes is proposed and demonstrated experimentally. The finite-difference time-domain method is used to interpret the experimental data and it is found that theoretical predictions properly account for the observed spectra.Keywords
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