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Theses

Ultrafast Nanoscale 3D Coherent X-ray Imaging

Abstract : Coherent lensless imaging techniques can break the limitations associated with conventional microscopy techniques. The configuration of coherent diffraction imaging makes it possible to image isolated non-crystalline objects with spatial resolutions limited, in principle, only by the illuminated wavelength (i.e. a few tens of nanometers to a few angstroms in the XUV and X domains, respectively). In this thesis, we develop and improve, experimentally and numerically, 2D and 3D lensless imaging techniques, for nanometric resolutions in a femtosecond single shot. Responding to the limitations of these techniques to aberrations and partial coherence, here, improvements of wavefront and spatial-coherence correction in holographic techniques are proposed. Indeed, the exploitation of the source properties makes possible to optimise the reconstruction from diffraction patterns or holograms in order to obtain the most faithful image possible in a single femtosecond flash. By exploiting machine vision concepts, this thesis also shows the possibility of accessing 3D information in single shots, extracted from two coherent X-ray diffraction patterns, taken simultaneously from two stereo angles. This opens the way towards the exploration of matter on nanometric volumes (voxels) solved at unmatched temporal resolutions.
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https://tel.archives-ouvertes.fr/tel-03091993
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Submitted on : Friday, January 1, 2021 - 1:16:45 AM
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  • HAL Id : tel-03091993, version 1

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Joana Cristina Matos Raimundo Duarte De. Ultrafast Nanoscale 3D Coherent X-ray Imaging. Optics / Photonic. Université Paris Saclay (COmUE), 2019. English. ⟨NNT : 2019SACLS372⟩. ⟨tel-03091993⟩

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