Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure

Peter Sondhauss; Jörgen Larsson; Michael Harbst; Graham A. Naylor; Anton Plech; Kees-Bertus Scheidt; Ola Synnergren; Michael Wulff; Justin S. Wark

doi:10.1117/12.641144

15 February 2006 Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure

Peter Sondhauss, Jörgen Larsson, Michael Harbst, Graham A. Naylor, Anton Plech, Kees-Bertus Scheidt, Ola Synnergren, Michael Wulff, Justin S. Wark

Author Affiliations +

Proceedings Volume 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X; 61180V (2006) https://doi.org/10.1117/12.641144
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

Zone folded coherent acoustic phonons were generated in a multilayered GaSb/InAs epitaxial heterostructure via rapid heating by femtosecond laser pulses. These phonons were probed by means of ultrafast x-ray diffraction. Phonons both from the fundamental acoustic branch and the first back-folded branch were detected. This represents the first clear evidence for phonon branch folding based directly on the atomic motion to which x-ray diffraction is sensitive. From a comparison of the measured phonon-modulated x-ray reflectivity with simulations, evidence was found for a reduction of the laser penetration depth. This reduction can be explained by the self-modulation of the absorption index due to photogenerated free carriers.

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Peter Sondhauss, Jörgen Larsson, Michael Harbst, Graham A. Naylor, Anton Plech, Kees-Bertus Scheidt, Ola Synnergren, Michael Wulff, and Justin S. Wark "Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure", Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180V (15 February 2006); https://doi.org/10.1117/12.641144

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