High wavevector optical phonons in microstructured Bismuth films.
We report the generation of high wavevector, large amplitude coherent optical phonons in a microstructured Bismuth film. A femtosecond laser pulse optically excites a periodic micron scale grating etched into a Bismuth film. The ultrafast excitation produced coherent optical phonon oscillations with wavevectors as large as 1 microm(-1), providing a possible method of generating an efficient sub-picosecond switch for hard x-rays.
Chen
Zhiyuan
Z
Department of Physics and Astronomy, University of Delaware Newark, DE 19716, USA.
Minch
Brian C
BC
DeCamp
Matthew F
MF