Ptychography Coherent Diffractive Imaging Systems for Extreme Ultraviolet and X-ray Sources
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.
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Department of Physics
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University of Colorado Boulder
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