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Title: Spatially confined low-power optically pumped ultrafast synchrotron x-ray nanodiffraction

The combination of ultrafast optical excitation and time-resolved synchrotron x-ray nanodiffraction provides unique insight into the photoinduced dynamics of materials, with the spatial resolution required to probe individual nanostructures or small volumes within heterogeneous materials. Optically excited x-ray nanobeam experiments are challenging because the high total optical power required for experimentally relevant optical fluences leads to mechanical instability due to heating. For a given fluence, tightly focusing the optical excitation reduces the average optical power by more than three orders of magnitude and thus ensures sufficient thermal stability for x-ray nanobeam studies. Delivering optical pulses via a scannable fiber-coupled optical objective provides a well-defined excitation geometry during rotation and translation of the sample and allows the selective excitation of isolated areas within the sample. Experimental studies of the photoinduced lattice dynamics of a 35 nm BiFeO{sub 3} thin film on a SrTiO{sub 3} substrate demonstrate the potential to excite and probe nanoscale volumes.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [2] ;  [3] ; ;  [4]
  1. Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
  2. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States)
  3. (United States)
  4. X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22482748
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; EXCITATION; NANOSTRUCTURES; OPTICAL PUMPING; SPATIAL RESOLUTION; STRONTIUM TITANATES; SYNCHROTRONS; THIN FILMS; TIME RESOLUTION; X RADIATION