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X-ray coherent diffraction imaging with an objective lens: Towards three-dimensional mapping of thick polycrystals

Abstract : We demonstrate an x-ray coherent imaging method that combines high spatial resolution with the ability to map grains within thick polycrystalline specimens. An x-ray objective serves to isolate an embedded grain. Iterative oversampling routines and Fourier synthesis are used to reconstruct the shape and strain field from the far-field intensity pattern. In a demonstration experiment a 500-nm Pt grain embedded in a polycrystalline Pt matrix is mapped in three dimensions without compromising the spatial resolution. No information on the pupil function of the lens is required and lens aberrations are not critical.
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Submitted on : Monday, August 31, 2020 - 8:38:11 AM
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A. Pedersen, Virginie Chamard, C. Detlefs, T. Zhou, D. Carbone, et al.. X-ray coherent diffraction imaging with an objective lens: Towards three-dimensional mapping of thick polycrystals. Physical Review Research, American Physical Society, 2020, 2 (3), pp.033031. ⟨10.1103/PhysRevResearch.2.033031⟩. ⟨hal-02925849⟩

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