Real-time imaging and dispersion of surface phonons in isotropic and anisotropic materials

Surface phonon propagation in anisotropic thin film structures displays beautiful and complex wavefronts. Using an interferometric optical pump and probe technique, we have imaged the propagation of surface phonons at frequencies up to 1 GHz in real time, allowing ‘movies’ of their wavefronts to be...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 316; pp. 29 - 34
Main Authors Wright, O.B., Sugawara, Y., Matsuda, O., Takigahira, M., Tanaka, Y., Tamura, S., Gusev, V.E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2002
Subjects
Imaging
Phonon focusing
Surface acoustic waves
Ultrafast
Ultrafast
Phonon focusing
Surface acoustic waves
Imaging
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Summary:Surface phonon propagation in anisotropic thin film structures displays beautiful and complex wavefronts. Using an interferometric optical pump and probe technique, we have imaged the propagation of surface phonons at frequencies up to 1 GHz in real time, allowing ‘movies’ of their wavefronts to be made with picosecond temporal and micron spatial resolutions. We image the propagation on various isotropic and anisotropic thin film structures, and give examples of how the dispersion relation can be directly derived from such movies.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)00421-0