Guidance of surface waves in a micron-scale phononic crystal line-defect waveguide

Sarah Benchabane (1) , Olivier Gaiffe (1) , Roland Salut (1) , Gwenn Ulliac (1) , Vincent Laude (1) , Kimmo Kokkonen (2)

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

We report on the direct observation of trapping and guiding of surface-guided elastic waves in a linear defect introduced into a micron-scale phononic crystal. Elastic field amplitude detection using laser scanning interferometry was used to characterize the different transmission regimes of the one-period wide line defect in a phononic crystal structure as a function of frequency and to discriminate phononic waveguiding from transmission outside the band gap. Surface density-of-states computations support the experimental observations.

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

Sarah Benchabane, Olivier Gaiffe, Roland Salut, Gwenn Ulliac, Vincent Laude, et al.. Guidance of surface waves in a micron-scale phononic crystal line-defect waveguide. Applied Physics Letters, 2015, 106 (8), pp.081903. ⟨10.1063/1.4913532⟩. ⟨hal-02868344⟩