TY  - JOUR
A1  - Schick, Daniel
A1  - Bojahr, Andre
A1  - Herzog, Marc
A1  - Gaal, P.
A1  - Vrejoiu, I.
A1  - Bargheer, Matias
T1  - Following Strain-Induced Mosaicity Changes of Ferroelectric Thin Films by Ultrafast Reciprocal Space Mapping
JF  - Physical review letters
N2  - We investigate coherent phonon propagation in a thin film of ferroelectric PbZr0.2Ti0.8O3 (PZT) by ultrafast x-ray diffraction experiments, which are analyzed as time-resolved reciprocal space mapping in order to observe the in-and out-of-plane structural dynamics, simultaneously. The mosaic structure of the PZT leads to a coupling of the excited out-of-plane expansion to in-plane lattice dynamics on a picosecond time scale, which is not observed for out-of-plane compression.
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevLett.110.095502
SN  - 0031-9007
SN  - 1079-7114
VL  - 110
IS  - 9
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Bojahr, Andre
A1  - Herzog, Marc
A1  - Mitzscherling, Steffen
A1  - Maerten, Lena
A1  - Schick, Daniel
A1  - Goldshteyn, J.
A1  - Leitenberger, Wolfram
A1  - Shayduk, R.
A1  - Gaal, P.
A1  - Bargheer, Matias
T1  - Brillouin scattering of visible and hard X-ray photons from optically synthesized phonon wavepackets
JF  - Optics express : the international electronic journal of optics
N2  - We monitor how destructive interference of undesired phonon frequency components shapes a quasi-monochromatic hypersound wavepacket spectrum during its local real-time preparation by a nanometric transducer and follow the subsequent decay by nonlinear coupling. We prove each frequency component of an optical supercontinuum probe to be sensitive to one particular phonon wavevector in bulk material and cross-check this by ultrafast x-ray diffraction experiments with direct access to the lattice dynamics. Establishing reliable experimental techniques with direct access to the transient spectrum of the excitation is crucial for the interpretation in strongly nonlinear regimes, such as soliton formation.
Y1  - 2013
U6  - https://doi.org/10.1364/OE.21.021188
SN  - 1094-4087
VL  - 21
IS  - 18
SP  - 21188
EP  - 21197
PB  - Optical Society of America
CY  - Washington
ER  -