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Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses

Journal Article · · Science Advances
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  1. Elettra Sincrotrone Trieste (Italy); DOE/OSTI
  2. Elettra Sincrotrone Trieste (Italy)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of Trento (Italy)
  5. National Research Council (CNR), Trieste (Italy). Istituto Officina dei Materiali (IOM)
  6. Univ. of Colorado, Boulder, CO (United States)
  7. Elettra Sincrotrone Trieste (Italy); National Research Council (CNR), Trieste (Italy). Istituto Officina dei Materiali (IOM)
+ Show Author Affiliations
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.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
European Research Council (ERC); Gordon and Betty Moore Foundation (GBMF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-99ER14982; SC0001299; SC0019126
OSTI ID:
1610410
Alternate ID(s):
OSTI ID: 1907871
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 7 Vol. 5; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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Energy scaling of water window high-order harmonic generation for single-shot soft X-ray spectroscopy and live-cell imaging text January 2020

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