Herzog, M.Leitenberger, W.Shayduk, R.van der Veen, R. M.Milne, C. J.Johnson, S. L.Vrejoiu, I.Alexe, M.Hesse, D.Bargheer, M.2011-12-162011-12-162011-12-16201010.1063/1.3402773https://infoscience.epfl.ch/handle/20.500.14299/75576WOS:000277020600015We experimentally demonstrate efficient switching of the hard x-ray Bragg reflectivity of a SrRuO3 /SrTiO3 superlattice by optical excitation of large-amplitude coherent acoustic superlattice phonons. The rocking curve changes drastically on a 1 ps timescale. The (0 0 116) reflection is almost extinguished (Delta R/R-0=-0.91), while the (0 0 118) reflection increases by more than an order of magnitude (Delta R/R-0=24.1). The change of the x-ray structure factor depends nonlinearly on the phonon amplitude, allowing manipulation of the x-ray response on a timescale considerably shorter than the phonon period. Numerical simulations for a superlattice with slightly changed geometry and realistic parameters predict a switching-contrast ratio Delta R/R-0 of 700 with high reflectivity. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3402773]Streak CameraPulsestext::journal::journal article::research article