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Proceedings Paper

Elastic bandgaps for surface modes in an ultrasonic lithium niobate phononic crystal
Author(s): S. Benchabane; A. Khelif; L. Robert; J. Y. Rauch; T. Pastureaud; V. Laude
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Paper Abstract

If a number of experiments aiming at demonstrating fundamental properties of phononic crystals have been successfully implemented, a need for enlarging both the research and the application fields of these structures has more recently risen. Surface acoustic waves appear as appealing candidates to set a new ground for illustrative experiments involving some different physical concepts from those usually observed when dealing with bulk waves. The possibility of a direct excitation of these surface waves on a piezoelectric material, and their already extensive use in ultrasonics also make them an interesting basis for phononic crystal based, acoustic signal processing devices. In this work, wave propagation in a square lattice, piezoelectric phononic crystal consisting of air holes etched in a lithium niobate matrix is both theoretically and experimentally investigated. The crystal was fabricated by reactive ion etching of a bulk lithium niobate substrate. Standard interdigital transducers were used to characterize the phononic structure by direct electrical generation and detection of surface waves. A full band gap around 200 MHz was experimentally demonstrated, and close agreement is found with theoretical predictions.

Paper Details

Date Published: 18 April 2006
PDF: 13 pages
Proc. SPIE 6182, Photonic Crystal Materials and Devices III (i.e. V), 618216 (18 April 2006); doi: 10.1117/12.662220
Show Author Affiliations
S. Benchabane, Institut FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
A. Khelif, Institut FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
L. Robert, Institut FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
J. Y. Rauch, Institut FEMTO-ST, CNRS, Univ. de Franche-Comté (France)
T. Pastureaud, TEMEX (France)
V. Laude, Institut FEMTO-ST, CNRS, Univ. de Franche-Comté (France)

Published in SPIE Proceedings Vol. 6182:
Photonic Crystal Materials and Devices III (i.e. V)
Richard M. De La Rue; Pierre Viktorovitch; Ceferino Lopez; Michele Midrio, Editor(s)

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