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Updated: Jul 7, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Waveguiding inside the complete band gap of a phononic crystal slab
Fu-Li Hsiao1, Abdelkrim Khelif, Hanane Moubchir
1Institut FEMTO-ST, Département LPMO, CNRS UMR 6174, Université de Franche-Comté, 25044 Besancon cedex, France.
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.
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