Waveguiding inside the complete band gap of a phononic crystal slab.
The propagation of acoustic waves in a square-lattice phononic crystal slab consisting of a single layer of spherical steel beads in a solid epoxy matrix is studied experimentally. Waves are excited by an ultrasonic transducer and fully characterized on the slab surface by laser interferometry. A complete band gap is found to extend around 300 kHz, in good agreement with theoretical predictions. The transmission attenuation caused by absorption and band gap effects is obtained as a function of frequency and propagation distance. Well confined acoustic wave propagation inside a line-defect waveguide is further observed experimentally.
Hsiao
Fu-Li
FL
Institut FEMTO-ST, Département LPMO, CNRS UMR 6174, Université de Franche-Comté, 25044 Besancon cedex, France.
Khelif
Abdelkrim
A
Moubchir
Hanane
H
Choujaa
Abdelkrim
A
Chen
Chii-Chang
CC
Laude
Vincent
V