Year: 2021
Type: article
Abstract: Significance Ptychography, a powerful scanning coherent diffractive imaging method, has attracted considerable attention for its general applicability. Here, we demonstrate X-ray linear dichroic ptychography to study the crystal orientations of the calcium carbonate in coral samples. In contrast to the absorption contrast commonly observed in linear dichroic imaging, dichroic ptychography at pre-oxygen K-edge shows significant and unique dichroic phase contrast, which has not been reported. The dichroic ptychography images reveal the presence of both narrow and wide c -axis angular spread in the submicrometer coral fragments, which are confirmed by 4D STEM. We expect X-ray linear dichroic ptychography to be a high-resolution, dose-efficient tool to broadly study optically anisotropic materials such as tooth enamel, bone, seashells, brittlestars, and polymers.
Institutions: California NanoSystems Institute, University of California, Los Angeles, University of Colorado Boulder, National Institute of Standards and Technology, Joint Institute for Laboratory Astrophysics, Lawrence Berkeley National Laboratory, National Energy Research Scientific Computing Center, Advanced Light Source, University of Wisconsin–Madison, University of California, Berkeley
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Nvidia, National Institutes of Health, Office of Science, National Nuclear Security Administration, National Cancer Institute, Division of Materials Research, Basic Energy Sciences, Laboratory Directed Research and Development, Lawrence Berkeley National Laboratory, Division of Materials Sciences and Engineering
Awards: G1071216263, G1079818582, G1143651532, G1286236842, G1286251239, G1395360581, G1863003419, G213222014, G222768804, G237429762, ADMINISTER THE STEWARDSHIP SCIENCE GRADUATE FELLOWSHIP (SSGF) AND THE LABORATORY RESIDENCE GRADUATE FELLOWSHIP (LRGF) PROGRAMS.
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OpenAlex ID: W3082554750