1.
Phys Rev E Stat Nonlin Soft Matter Phys
; 76(5 Pt 2): 056601, 2007 Nov.
Artigo
em Inglês
| MEDLINE
| ID: mdl-18233776
RESUMO
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.