TY - JOUR
AU - F. Bencivenga
AU - R. Mincigrucci
AU - F. Capotondi
AU - L. Foglia
AU - D. Naumenko
AU - A. Maznev
AU - E. Pedersoli
AU - A. Simoncig
AU - F. Caporaletti
AU - V. Chiloyan
AU - R. Cucini
AU - F. Dallari
AU - R. Duncan
AU - Travis Frazer
AU - G. Gaio
AU - A. Gessini
AU - L. Giannessi
AU - S. Huberman
AU - Henry Kapteyn
AU - Joshua Knobloch
AU - G. Kurdi
AU - N. Mahne
AU - M. Manfredda
AU - A. Martinelli
AU - Margaret Murnane
AU - E. Principi
AU - L. Raimondi
AU - S. Spampinati
AU - C. Spezzani
AU - M. Trovò
AU - M. Zangrando
AU - G. Chen
AU - G. Monaco
AU - K. Nelson
AU - Claudio Masciovecchio
AB - 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.
BT - Science Advances
DA - 2019-07
DO - 10.1126/sciadv.aaw5805
N2 - 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.
PY - 2019
EP - eaaw5805
T2 - Science Advances
TI - Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses
UR - https://advances.sciencemag.org/content/5/7/eaaw5805.full
VL - 5
ER -