Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment
Author(s)
Maznev, A. A.; Bencivenga, F.; Cannizzo, A.; Capotondi, F.; Cucini, R.; Duncan, R. A.; Feurer, T.; Frazer, T. D.; Foglia, L.; Frey, H.-M.; Kapteyn, H.; Knobloch, J.; Knopp, G.; Masciovecchio, C.; Mincigrucci, R.; Monaco, G.; Murnane, M.; Nikolov, I.; Pedersoli, E.; Simoncig, A.; Vega-Flick, A.; Nelson, K. A.; ... Show more Show less
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We investigate the excitation of coherent acoustic and optical phonons by ultrashort extreme ultraviolet (EUV) pulses produced by a free electron laser. Two crossed femtosecond EUV (wavelength 12.7 nm) pulses are used to excite coherent phonons at a wavelength of 280 nm, which are detected via diffraction of an optical probe beam. Longitudinal and surface acoustic waves are measured in BK-7 glass, diamond, and Bi4Ge3O12; in the latter material, the excitation of a coherent optical phonon mode is also observed. We discuss probing different acoustic modes in reflection and transmission geometries and frequency mixing of surface and bulk acoustic waves in the signal. The use of extreme ultraviolet radiation will allow the creation of tunable GHz to THz acoustic sources in any material without the need to fabricate transducer structures.
Date issued
2018-11Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Maznev, A. A. et al. "Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment." Applied Physics Letters 113, 22 (November 2018): 221905 © 2018 Author(s)
Version: Final published version
ISSN
0003-6951
1077-3118
Keywords
Physics and Astronomy (miscellaneous)