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SUMMARY:Manuel Guizar-Sicairos: Mapping 3D Nanostructures with X-Ray Ptych
 ography
DTSTART:20210930T170000
DTEND:20210930T180000
DTSTAMP:20260510T183453Z
UID:cee89fe012084d23f523e154b79ddf70f69552e937f87ac73d899fe3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Manuel Guizar-Sicairos\, Paul Scherrer Institut (PSI)\, S
 witzerland\nThis event is part of the EPFL Seminar Series in Imaging.\n\n
  \nAbstract. Access to local information about material composition and i
 ts 3D distribution at the nanoscale is of chief importance for studying fu
 nctional hierarchical materials\, for example in biology\, materials scien
 ce\, and energy research. The small wavelength of X-rays offers the opport
 unity to image with very high resolution. This property combined with the 
 high-penetration of photons\, with energies on the order of multiple keV\,
  are ideal for nanoscale-resolution imaging in a minimally intrusive\, i.e
 . non-destructive\, procedure. In this talk I will discuss principles\, ap
 plications\, and latest advances on two techniques that we develop to prob
 e nanostructure: ptychographic X-ray nanotomography (PXCT) and small-angle
  scattering tensor tomography (SASTT). PXCT is a coherent lensless imaging
  technique that circumvents the difficulties of fabricating X-ray lenses o
 f sufficient resolution by replacing the imaging lens with iterative phase
 -retrieval algorithms. Currently it achieves a resolution of 15 nm in 3D i
 n volumes of thousands of cubic microns and 100 nm in volumes of a million
  cubic microns. SASTT\, highly complementary to PXCT\, is capable of quick
  surveys of average local 3D nanostructure anisotropy. SASTT bridges and c
 orrelates information from nano (1 – 200 nm) and macroscopic (1 – 10 m
 m) length scales. Examples from a number of areas will be presented includ
 ing integrated circuits\, neuroscience\, and energy research. Latest resul
 ts leveraging sparsity to combine PXCT with spectroscopy for structural an
 d functional nanoscale characterization will also be discussed.\n\n Biogr
 aphy. Manuel Guizar-Sicairos received his B.Sc. and M.Sc. from the Tecnol
 ógico de Monterrey\, Mexico\, and his Ph.D. from the University of Roches
 ter\, USA\, in 2010. Currently\, he is a beamline scientist at the coheren
 t small-angle X-ray scattering (cSAXS) beamline of the Swiss Light Source 
 (SLS) and has coauthored over 100 peer-reviewed publications. His research
  focuses on the development\, advancement\, and application of coherent X-
 ray imaging techniques\, in particular on innovations in computational ima
 ging\, tomography\, ptychography\, and other image reconstruction methods.
  Manuel received the 2019 ICO prize for his contributions to the field and
  is a Fellow Member of the OSA. ion beam polish cycle to acquire such thre
 e-dimensional pictures.
LOCATION:https://epfl.zoom.us/j/65705283122
STATUS:CONFIRMED
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