Berlin 2005 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 8: Gl
äser II (gemeinsam mit FV DY)

DF 8.8: Vortrag

Montag, 7. März 2005, 16:30–16:45, TU A060

Mapping of Microwave-Induced Phonons by micro-Brillouin Spectroscopy: High Resolution Access To Acoustic Fields In Piezoelectric Materials — •J.K. Krüger, J. Mainka, L. Le Brizoual, B. Vincent, O. Elmazria, L. Bouvot, R. Sanctuary, D. Rouxel, and P. Alnot — Laboratoire Européen de Recherche Universitaire : Saarland-Lorraine, Universität des Saarlandes, Bau 38, D-66041 Saarbrücken

Brillouin spectroscopy (BS) is a versatile technique to measure acoustic properties at hypersonic frequencies and has been proven to be capable to detect thermally excited surface- and guided acoustic waves at microwave frequencies. BS on microwave induced phonons, generated at the surface of a piezoelectric crystal can be used to determine the hypersonic attenuation from the decay of the Stokes intensity of the BS. Only recently, BS was used for studying acoustic microscopy (BM). It turns out that this new technique is able to characterize the distribution of acoustic fields, generated by inter digital finger structures (IDT) at microwave frequencies in piezoelectric materials. The aim of this talk is to elucidate the efficiency of the electro-acoustic generation of hypersonic waves in thin piezoelectric films including their field properties and especially their spatial decay within the film plane.