TY  - JOUR
A1  - Sander, Mathias
A1  - Herzog, Marc
A1  - Pudell, Jan-Etienne
A1  - Bargheer, Matias
A1  - Weinkauf, N.
A1  - Pedersen, M.
A1  - Newby, G.
A1  - Sellmann, J.
A1  - Schwarzkopf, J.
A1  - Besse, V.
A1  - Temnov, V. V.
A1  - Gaal, P.
T1  - Spatiotemporal Coherent Control of Thermal Excitations in Solids
T2  - Physical review letters
N2  - X-ray reflectivity measurements of femtosecond laser-induced transient gratings (TG) are applied to demonstrate the spatiotemporal coherent control of thermally induced surface deformations on ultrafast time scales. Using grazing incidence x-ray diffraction we unambiguously measure the amplitude of transient surface deformations with sub-angstrom resolution. Understanding the dynamics of femtosecond TG excitations in terms of superposition of acoustic and thermal gratings makes it possible to develop new ways of coherent control in x-ray diffraction experiments. Being the dominant source of TG signal, the long-living thermal grating with spatial period. can be canceled by a second, time-delayed TG excitation shifted by Lambda/2. The ultimate speed limits of such an ultrafast x-ray shutter are inferred from the detailed analysis of thermal and acoustic dynamics in TG experiments.
Y1  - 2017
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/46432
SN  - 0031-9007
SN  - 1079-7114
VL  - 119
SP  - 102
EP  - 110
PB  - American Physical Society
CY  - College Park
ER  -