TY - JOUR
AU - A. Maznev
AU - F. Bencivenga
AU - A. Cannizzo
AU - F. Capotondi
AU - R. Cucini
AU - R. Duncan
AU - Thomas Feurer
AU - Travis Frazer
AU - L. Foglia
AU - H.-M. Frey
AU - Henry Kapteyn
AU - Joshua Knobloch
AU - G. Knopp
AU - Claudio Masciovecchio
AU - R. Mincigrucci
AU - G. Monaco
AU - Margaret Murnane
AU - I. Nikolov
AU - E. Pedersoli
AU - A. Simoncig
AU - A. Vega-Flick
AU - K. Nelson
AB - 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 Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub>; 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.
BT - Applied Physics Letters
DA - 2018-11
DO - 10.1063/1.5048023
N2 - 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 Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub>; 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.
PY - 2018
EP - 221905
T2 - Applied Physics Letters
TI - Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment
UR - https://aip.scitation.org/doi/full/10.1063/1.5048023
VL - 113
SN - 0003-6951
ER -