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

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2007
Major/Subject
Mcode
Degree programme
Language
en
Pages
083517
Series
Applied Physics Letters, Volume 91, Issue 8
Abstract
Surface acoustic wave propagation within a two-dimensional phononic band gapstructure 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.
Description
Keywords
band gab, surface acoustic waves, interdigital transducers, acoustic waves, phononic chystals
Other note
Citation
Kokkonen, Kimmo & Kaivola, Matti & Benchabane, Sarah & Khelif, Abdelkrim & Laude, Vincent. 2007. Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry. Applied Physics Letters. Volume 91, Issue 8. ISSN 0003-6951 (printed). DOI: 10.1063/1.2768910.