Trapping and guiding of acoustic waves by defect modes in a full-band-gap ultrasonic crystal
Trapping and guiding of acoustic waves by defect modes in a full-band-gap ultrasonic crystal
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DOI：
10.1103/physrevb.68.214301
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发表时间：
2003-12-01
影响因子：
3.7
通讯作者：
Laude, V
中科院分区：
文献类型：
--
作者：
Khelif, A;Choujaa, A;Laude, V
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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.