Received Hani E. Elsayed-Ali BS
degree from the University of Miami, Florida, in December 1979, his MS and
Ph.D. degrees from the University of Illinois, Urbana, Illinois in January 1982
and January 1985, respectively, all in electrical engineering. Upon graduation,
he worked as a visiting assistant professor at the University of Illinois
conducting research in the areas of gas discharges and thin film deposition. In
December 1985, he joined the Laboratory for Laser Energetics at the University
of Rochester as a scientist. At Rochester he worked on femtosecond and
picosecond laser probing of electronic and structural properties of material
surfaces and thin films. He joined Old Dominion University in December 1992 and
he is currently Batten Endowed Professor and Eminent Scholar of Electrical
Engineering. His current research interests are mainly in laser-solid
interactions, ultrafast laser probing of surface and thin film reactions, and
thin film fabrication and characterization. He authored and co-authored over
130 refereed journal articles and holds 3 patents. He was the recipient of the
ODU 16th Annual Faculty Research Award in 2000, Excellence in Innovation in
Hampton Roads Award from the Hampton Roads Technology Council in 2006, and the
ODU Doctoral Mentoring Award in 2012.
Title:
Lattice dynamics of of laser heated thin films and
surfaces studied by ultrafast electron diffraction
Abstract: Ultrafast
electron diffraction (UED) is used to probe the lattice dynamics of picosecond
and femtosecond laser-heated thin films and surfaces. In UED, a photoactivated electron gun is used to produce
electron pulses that are synchronized with an ultrafast laser pulses. The
temporal resolution of the UED system depends on the laser pulse width and
electron pulse broadening. Pump-probe experiments are conducted by a variable
spatial time delay between the laser pulse photoactivating the cathode of the
electron gun and that interacting with the sample. Examples of studied
performed at Old Dominion University on surface dynamics of In(111) and Ge(111)
single crystal and on Bi and Sb thin film and nanoparticles are presented.