Title :
Propagation of picosecond acoustic pulses in semiconductor heterostructures probed by ultrafast X-ray diffraction
Author :
Cavalleri, A. ; Siders, C.W. ; Guo, T. ; Wilson, K.R. ; Barty, C.P. ; Sokolowski-Tinten, K. ; von der Linde, D. ; Kammler, M. ; Horn von Hoegen, M.
Author_Institution :
Dept. of Chem. & Biochem., California Univ., San Diego, La Jolla, CA, USA
Abstract :
Summary form only given. We present the first optical-pump X-ray probe study on coherent lattice dynamics in semiconductor heterostructures. We have observed propagation of optically generated picosecond acoustic pulses within crystalline Ge films and into the underlying Si substrate, where 20 femtometer lattice compression was observed.
Keywords :
X-ray diffraction; acoustic pulses; elemental semiconductors; germanium; interface phonons; optical pumping; semiconductor heterojunctions; Ge-Si; Si; coherent lattice dynamics; crystalline Ge films; lattice compression; optical-pump X-ray probe study; optically generated picosecond acoustic pulses; picosecond acoustic pulse propagation; semiconductor heterostructures; ultrafast X-ray diffraction; underlying Si substrate; Acoustic propagation; Acoustic pulses; Crystallization; Lattices; Optical films; Optical propagation; Optical pulse generation; Probes; Semiconductor films; Ultrafast optics;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 1999. QELS '99. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-576-X
DOI :
10.1109/QELS.1999.807674
