Campuses:

ptychography

Thursday, August 17, 2017 - 2:00pm - 2:45pm
Andrew Maiden (University of Sheffield)
Relative to the rapid pace set in the X-ray and visible light regimes, developing electron ptychography into a useful, routine method for electrons has so far been a slow journey. The path has been hampered by hurdles such as inelastic and dynamical scattering, instrument instabilities and limited beam coherence, as well as by the sub-nanometer resolutions that electron microscopists expect. Today, however, the route is being cleared using advances from the X-ray and visible light regions of the spectrum, and momentum is beginning to build.
Thursday, August 17, 2017 - 10:30am - 11:00am
Brian Preskitt (University of California, San Diego)
The phase retrieval problem has appeared in a multitude of applications for decades. While ad hoc solutions have existed since the early 1970s, recent developments have provided algorithms that offer promising theoretical guarantees under increasingly realistic assumptions. Motivated by ptychographic imaging, we generalize a recent result on phase retrieval of a one dimensional signal to recover a two dimensional image from phaseless measurements, using a tensor product formulation to extend the previous work.
Monday, August 14, 2017 - 10:00am - 10:45am
Andreas Menzel (Paul Scherrer Institute)
Ptychography comprises sampling and analyzing the object’s spatial spectrogram by windowed (or “short-space”) Fourier transforms. Its capability to reconstruct both image and illumination, as well as other experimental conditions including instabilities has proven promising for high-resolution X-ray microscopy.
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