Observation of surface-guided waves in holey hypersonic phononic crystal

Sarah Benchabane (1) , Olivier Gaiffe (1) , Gwenn Ulliac (1) , Roland Salut (1) , Younes Achaoui (1) , Vincent Laude (1)

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

We observe experimentally the propagation of surface-guided waves in a hypersonic phononic crystal, both in the radiative and nonradiative regions of the spectrum. Combining electrical measurements in reflection and transmission as well as optical maps of the surface displacement, a band gap extending from 0.6 to 0.95 GHz is identified in a square lattice array of 1 μm radius air holes milled in lithium niobate. The optical measurements reveal the transmission of surface-guided waves above the band gap, well inside the sound cone.

Mots clés: acoustic wave propagation; acoustic wave transmission; energy gap; lithium compounds; phononic crystals; surface acoustic waves; Phonons in crystal lattices; Other inorganic compounds; Acoustical properties

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]; Micro et nanotechnologies/Microélectronique; Optique [physics.optics]

Sarah Benchabane, Olivier Gaiffe, Gwenn Ulliac, Roland Salut, Younes Achaoui, et al.. Observation of surface-guided waves in holey hypersonic phononic crystal. Applied Physics Letters, 2011, 98 (17), pp.1908. ⟨10.1063/1.3583982⟩. ⟨hal-00639209⟩