Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry

K. Kokkonen, M. Kaivola, S. Benchabane, A. Khelif, V. Laude

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Surface acoustic wave propagation within a two-dimensional phononic band gap structure has been studied using a heterodyne laser interferometer. Acoustic waves are launched by interdigital transducers towards a square lattice of holes etched in a piezoelectric medium. Interferometer measurements performed at frequencies lying below, within, and above the expected band gap frequency range provide direct information of the wave interaction with the phononic crystal, revealing anisotropic scattering into higher diffraction orders depending on the apparent grating pitch at the boundary between the phononic crystal and free surface. Furthermore, the measurements also confirm the existence of an elastic band gap, in accordance with previous electrical measurements and theoretical predictions.
Original languageEnglish
Article number083517
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume91
Issue number8
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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