Abstract
We present a novel method of creating phonon excitations in a thin film of a chalcogenide glass. Phonon generation and the detection is done optically and thus allows measurement with picosecond time resolution. Current methods of studying phonon propagation involve ultrasonics or heat-pulse techniques. These use electronics, and the time resolution is limited to nanoseconds. Our picosecond method is a promising tool for studying propagation of phonons with extremely short mean free paths. As a demonstration of this method we measured the sound velocity in a film of a-SiO2 and compare it with a computer simulation.
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References
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© 1984 Springer-Verlag Berlin Heidelberg
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Thomsen, C., Strait, J., Vardeny, Z., Maris, H.J., Tauc, J., Hauser, J.J. (1984). Picosecond Optical Excitation of Phonons in Amorphous As2Te3 . In: Auston, D.H., Eisenthal, K.B. (eds) Ultrafast Phenomena IV. Springer Series in Chemical Physics, vol 38. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82378-7_38
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DOI: https://doi.org/10.1007/978-3-642-82378-7_38
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