TITLE

X-ray imaging of surface acoustic waves generated in semiconductor crystals by an external transducer

AUTHOR(S)
Shilo, D.; Lakin, E.; Zolotoyabko, E.; Härtwig, J.; Baruchel, J.
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/3/2003, Vol. 82 Issue 9, p1374
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate successful x-ray-diffraction imaging of high-frequency (0.29-GHz) surface acoustic waves (SAWs) propagating in semiconductor crystals (Si and GaAs) with no deposited electrodes on top of them. Experiments were performed at the ID19 beamline of the European Synchrotron Radiation Facility (Grenoble). We used the stroboscopic x-ray topography technique, in which x-ray bursts coming from the storage ring are synchronized with the excited acoustic waves. This technique is able to visualize individual acoustic wave fronts of traveling SAWs and their distortions caused by phonon scattering. In order to generate SAW in semiconductor crystals the latter were coupled to LiNbO[sub 3]-based SAW transducers via contact liquids. The maximum SAW transmission is achieved for evanescent waves under optimized coupling conditions at the liquid/sample interface. The technique developed opens a way to directly study phonon interaction with defects in nonpiezoelectric and weakly piezoelectric crystals.
ACCESSION #
9176126

 

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