Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 10: Spectroscopy and Microscopy I with X-rays and Ions

KFM 10.1: Hauptvortrag

Dienstag, 13. März 2018, 09:30–10:00, EMH 225

Insights into the Inside provided by Coherent X-ray Imaging — •Tim Salditt — Georg-August-Universität Göttingen, Institut für Röntgenphysik, Friedrich-Hund-Platz 1, 37077 Göttingen

X-rays can provide information about the functional architecture of materials, including soft and biological matter [1 ,2], also in a heterogeneous state and in operando [3]. However, the specific advantages of hard x-rays in view of penetration power, high spatial resolution, quantitative contrast, and compatibility with environmental conditions is to date not fully exploited, mainly due to shortcomings in x-ray optics. With the advent of highly brilliant radiation, coherent focusing, and lens-less diffractive imaging this situation has begun to change. Nano-focused coherent x-ray synchrotron beams are now routinely used for scanning as well as for full field holographic x-ray imaging, in 2d and 3d. Even 4d movies of materials [4] are enabled by time-resolved tomography, providing new insights into the inside of materials as well as functional processes. In this talk I present the optical concepts and challenges, including phase retrieval and image reconstruction, and explain all the buss about holography, ptychography and tomography.

[1] M. Bartels, M. Krenkel, J. Haber, R. N. Wilke, and T. Salditt, Phys. Rev. Lett. (2015), 114, 048103. [2] M. Töpperwien, M. Krenkel, D. Vincenz , F. Stöber, A. M. Oelschlegel, J. Goldschmidt and T. Salditt, Scientific Reports (2017), 7, 42847. [3] J. Wallentin, M. Osterhoff and T. Salditt, Adv. Mater. (2016), 28, 1788. [4] A. Ruhlandt, M. Töpperwien, M. Krenkel, R. Mokso, and T. Salditt, Scientific Reports (2017), 7, p. 6487.