Waveguiding in a complete band gap phononic crystal slab

Fu-Li Hsiao (1, 2) , Abdelkrim Khelif (1) , Hanane Moubchir (1) , Abdelkrim Choujaa (1) , Chii-Chang Chen (2) , Vincent Laude (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
2 Institute of Optical Sciences

The propagation of acoustic waves in a phononic crystal slab consisting of single layer of spherical steel beads in a solid epoxy matrix is studied experimentally. The beads are arranged periodically with a square lattice. Waves are excited by a 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 defect line waveguide is further observed experimentally.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Fu-Li Hsiao, Abdelkrim Khelif, Hanane Moubchir, Abdelkrim Choujaa, Chii-Chang Chen, et al.. Waveguiding in a complete band gap phononic crystal slab. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2007, 76 (5), pp.056601. ⟨hal-00283930⟩