Spatially confined low-power optically pumped ultrafast synchrotron x-ray nanodiffraction
Abstract
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 BiFeO3 thin film on a SrTiO3 substrate demonstrate the potential to excite and probe nanoscale volumes.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2015
- Source ID
- 10.1063/1.4929436
Entities
People
- Carolina Adamo
- Darrell G. Schlom
- Haidan Wen
- Jack A. Tilka
- Joonkyu Park
- Margaret P. Cosgriff
- Paul G. Evans
- Pice Chen
- Qingteng Zhang
- Yi Zhu
Organizations
- Argonne National Laboratory
- Army Research Office
- Cornell University
- Division of Graduate Education
- University of Wisconsin–Madison