Mr. Kasra Nowrouzi Profile

Kasra Nowrouzi

Graduate Student Research Assistant at Lawrence Berkeley National Lab

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Proceedings Article | 9 September 2019 Paper

Correlative conventional scanning and ptychographic soft x-ray microscopy

Jiangtao Zhao, Kasra Nowrouzi, Richard Celestre, Matthew Marcus, Young-Sang Yu, David Shapiro

Proceedings Volume 11112, 111120C (2019) https://doi.org/10.1117/12.2531177

KEYWORDS: X-rays, X-ray imaging, X-ray microscopy, Image resolution, Chemical analysis, Spatial resolution, Diffraction, Imaging systems, Nickel, Synchrotron x-ray imaging

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Recent plans for x-ray synchrotrons to upgrade to new high brightness lattices have created great excitement about the potential for coherent x-ray imaging to provide a view of nano-materials with high spatial and temporal resolution. However, with increased x-ray brightness comes the inherent risk of radiation damage and the limited speed of current experimental systems. The Advanced Light Source has an extensive program in coherent scanning transmission x-ray microscopy (STXM) and ptychographic imaging with four beamlines covering an energy range of 200 to 2500 eV. Current instrument development efforts are focused on high-dynamic scanning for increased speed and the use of fast x-ray pixel detectors for high resolution ptychographic imaging. Our new microscope, called Nanosurveyor2, can scan at rates of up to 1 mm per second and has achieved a resolution of 3 times the x-ray wavelength. Using this system, we are developing novel scan trajectories and low dose imaging methods which combine high speed conventional STXM imaging with high resolution ptychography. Principal component analysis is used to extract high statistics spectra from noisy and low-resolution STXM data which are then used to _t a small number of ptychographic images for high spatial resolution chemical mapping with relatively low dose. We consider applications in the energy sciences where x-ray exposure has been observed to reduce the oxidation state of relevant compounds.

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