@article{11875,
  author = {F. Bencivenga and R. Mincigrucci and F. Capotondi and L. Foglia and D. Naumenko and A. Maznev and E. Pedersoli and A. Simoncig and F. Caporaletti and V. Chiloyan and R. Cucini and F. Dallari and R. Duncan and Travis Frazer and G. Gaio and A. Gessini and L. Giannessi and S. Huberman and Henry Kapteyn and Joshua Knobloch and G. Kurdi and N. Mahne and M. Manfredda and A. Martinelli and Margaret Murnane and E. Principi and L. Raimondi and S. Spampinati and C. Spezzani and M. Trovò and M. Zangrando and G. Chen and G. Monaco and K. Nelson and Claudio Masciovecchio},
  title = {Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses},
  abstract = {Advances in developing ultrafast coherent sources operating at extreme ultraviolet (EUV) and x-ray wavelengths allow the extension of nonlinear optical techniques to shorter wavelengths. Here, we describe EUV transient grating spectroscopy, in which two crossed femtosecond EUV pulses produce spatially periodic nanoscale excitations in the sample and their dynamics is probed via diffraction of a third time-delayed EUV pulse. The use of radiation with wavelengths down to 13.3 nm allowed us to produce transient gratings with periods as short as 28 nm and observe thermal and coherent phonon dynamics in crystalline silicon and amorphous silicon nitride. This approach allows measurements of thermal transport on the ~10-nm scale, where the two samples show different heat transport regimes, and can be applied to study other phenomena showing nontrivial behaviors at the nanoscale, such as structural relaxations in complex liquids and ultrafast magnetic dynamics.},
  year = {2019},
  journal = {Science Advances},
  volume = {5},
  pages = {eaaw5805},
  month = {2019-07},
  url = {https://advances.sciencemag.org/content/5/7/eaaw5805.full},
  doi = {10.1126/sciadv.aaw5805},
}