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Berlin 2012 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 6: X-ray imaging, holography and tomography

MI 6.7: Vortrag

Mittwoch, 28. März 2012, 14:00–14:15, TA 201

Soft X-ray tomoholography — •Erik Guehrs1,2, Andreas M. Stadler2, Sam Flewett1, Stefanie Frömmel1, Jan Geilhufe3, Bastian Pfau1, Torbjörn Rander1, Stefan Schaffert1, Georg Büldt2,4, and Stefan Eisebitt1,31Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin — 2Institute of Complex Systems, Forschungszentrum Jülich, 52428 Jülich — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin — 4Research-Educational Centre Bionanophysics, Moscow Institute of Physics and Technology, 141700 Dolgoprudniy, Russia

Fourier transform holography (FTH) is a well established imaging method in the soft X-ray regime. In common mask-based FTH the reference wave is produced by a small pinhole which is physically connected to the sample. Due to the high aspect ratio (1:10) of the pinhole it is not possible to record a tomographic dataset as the required rotation of the sample blocks the transmission through the pinhole at small angles. Therefore, only 2D projections have been imaged until now using soft X-ray FTH. However, the determination of the three-dimensional structure of samples is of high interest in many scientific areas. We demonstrate an X-ray imaging method which combines Fourier transform holography with tomography ("tomoholography'') for 3D microscopic imaging. A 3D image of a diatom shell with a spatial resolution of 140 nm is presented. The experiment is realized by using a small gold sphere as reference wave source for holographic imaging.

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