@article{SanderPudellHerzogetal.2017,
  author    = {Sander, Mathias and Pudell, Jan-Etienne and Herzog, Marc and Bargheer, Matias and Bauer, R. and Besse, V. and Temnov, V. and Gaal, P.},
  title     = {Quantitative disentanglement of coherent and incoherent laser-induced surface deformations by time-resolved x-ray reflectivity},
  series = {Applied physics letters},
  volume    = {111},
  journal   = {Applied physics letters},
  publisher = {American Institute of Physics},
  address   = {Melville},
  issn      = {0003-6951},
  doi       = {10.1063/1.5004522},
  pages     = {4},
  year      = {2017},
  abstract  = {We present time-resolved x-ray reflectivity measurements on laser excited coherent and incoherent surface deformations of thin metallic films. Based on a kinematical diffraction model, we derive the surface amplitude from the diffracted x-ray intensity and resolve transient surface excursions with sub-angstrom spatial precision and 70 ps temporal resolution. The analysis allows for decomposition of the surface amplitude into multiple coherent acoustic modes and a substantial contribution from incoherent phonons which constitute the sample heating. Published by AIP Publishing.},
  language  = {en}
}
@article{PudellSanderBaueretal.2019,
  author    = {Pudell, Jan-Etienne and Sander, M. and Bauer, R. and Bargheer, Matias and Herzog, Marc and Ga{\´a}l, Peter},
  title     = {Full Spatiotemporal Control of Laser-Excited Periodic Surface Deformations},
  series = {Physical review applied},
  volume    = {12},
  journal   = {Physical review applied},
  number    = {2},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {2331-7019},
  doi       = {10.1103/PhysRevApplied.12.024036},
  pages     = {11},
  year      = {2019},
  abstract  = {We demonstrate full control of acoustic and thermal periodic deformations at solid surfaces down to subnanosecond time scales and few-micrometer length scales via independent variation of the temporal and spatial phase of two optical transient grating (TG) excitations. For this purpose, we introduce an experimental setup that exerts control of the spatial phase of subsequent time-delayed TG excitations depending on their polarization state. Specific exemplary coherent control cases are discussed theoretically and corresponding experimental data are presented in which time-resolved x-ray reflectivity measures the spatiotemporal surface distortion of nanolayered heterostructures. Finally, we discuss examples where the application of our method may enable the control of functional material properties via tailored spatiotemporal strain fields.},
  language  = {en}
}