Ptychography Coherent Diffractive Imaging Systems for Extreme Ultraviolet and X-ray Sources

Author
Abstract
Ptychography coherent diffractive imaging is a rapidly developing method for microscopic imaging with coherent X-ray and extreme ultraviolet sources. The technique, which shifts the role of image formation from a physical optic to a computational algorithm, provides a route toward photon efficient imaging systems with diffraction-limited resolution. When combined with high-energy coherent light sources, a microscope capable of probing the nanoworld with exquisite elemental and chemical sensitivity is realized. However, these systems come with concessions such as the large data volume required to form an image, long data acquisition times, and relatively complex image reconstruction methods.

This thesis focuses on the development and extension of ptychography coherent diffractive imaging to higher throughput modalities. This is demonstrated with the formulation of the multiple beam ptychography method that uses several beams to simultaneously probe different parts of a sample. This is first shown with beams of different wavelengths and later with different polarization states. The technique is then extended for beams with identical wavelengths and polarizations by controlling the aliasing of the measured signal.
Finally, an X-ray spectromicroscopy study of a highly heterogeneous meteoric grain is dis-cussed. Ptychography coherent diffractive imaging is combined with scanning transmission X-ray microscopy and X-ray absorption spectroscopy to reveal the meteorite’s mineralogical properties through chemical, elemental, and textural identification with a resolution more than an order of magnitude lower than previous similar studies.
Year of Publication
2020
Academic Department
Department of Physics
Degree
Ph.D.
Number of Pages
129
Date Published
2020-11
University
University of Colorado Boulder
City
Boulder
JILA PI Advisors
Advisors - Other
Rafael Piestun
Sadegh Yazdi
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