title: Waveguiding inside the complete band gap of a phononic crystal slab.
abstract: 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.
authors.affiliation: Institut FEMTO-ST, Département LPMO, CNRS UMR 6174, Université de Franche-Comté, 25044 Besancon cedex, France.
authors.forename: Fu-Li
authors.initials: FL
authors.lastname: Hsiao
authors.forename: Abdelkrim
authors.initials: A
authors.lastname: Khelif
authors.forename: Hanane
authors.initials: H
authors.lastname: Moubchir
authors.forename: Abdelkrim
authors.initials: A
authors.lastname: Choujaa
authors.forename: Chii-Chang
authors.initials: CC
authors.lastname: Chen
authors.forename: Vincent
authors.initials: V
authors.lastname: Laude