Phononic bandgap guidance of acoustic modes in photonic crystal fibers

Vincent Laude (1) , Abdelkrim Khelif (1) , Sarah Benchabane (1) , Mikael Wilm (1) , Thibaut Sylvestre (1) , Bertrand Kibler (1) , Arnaud Mussot (1) , John M. Dudley (1) , Hervé Maillotte (1)

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

The existence of guided elastic modes in a photonic crystal fiber for an arbitrary cross-section is demonstrated using waveguide finite element analysis. In particular, it is shown that band-gaps exist for guided elastic modes along the longitudinal fiber axis, and thus a photonic crystal fiber can be simultaneously a phononic crystal fiber. The introduction of a defect within the two-dimensional crystal leads to the formation of highly localized elastic waveguide modes that co-propagate in the same core volume as the guided optical mode. We consider the application of these properties to the suppression of stimulated Brillouin scattering, and to enhanced collinear acousto-optical interactions.

Mots clés: matériaux à bandes interdites; fibre photonique; modes acoustiques; effet Brillouin stimulé; interaction acousto-optique guidée

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

Vincent Laude, Abdelkrim Khelif, Sarah Benchabane, Mikael Wilm, Thibaut Sylvestre, et al.. Phononic bandgap guidance of acoustic modes in photonic crystal fibers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 71, pp.045107. ⟨hal-00001404⟩