Regensburg 2016 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 3: X-ray Imaging, Holography, Ptychography and Tomography

MI 3.3: Vortrag

Mittwoch, 9. März 2016, 11:00–11:15, H5

Efficiency simulation and measurements for MZP hard X-ray nanofocusing and imaging — •Jakob Soltau¹, Christian Eberl², Tim Salditt¹, Hans-Ulrich Krebs², and Markus Osterhoff¹ — ¹Röntgenphysik, Uni-Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen — ²Materialphysik, Uni-Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen

Latest developments in fabrication and inspection technologies have enabled the manufacturing of multilayer zone plates (MZP) with high aspect ratio using pulsed laser deposition [1]. This allows sub-5 nm focusing of hard X-rays in two dimensions and enabling photonic imaging on a nanometer scale. To improve the efficiency of zone plates, we investigated the propagation of the electromagnetic wave field inside and behind the MZP with two different simulation methods. The results are compared with the latest measurements of a 2D-MZP with an outermost zone width of only 5 nm used at the synchrotron source at DESY. The simulation methods we used are: a multi slice propagation according to Huygens, which can handle almost any geometry with only few artefacts and a finite difference simulation which has already stated its capabilities in the waveguide development [2]. The central challenge in the development of hard X-ray nanofocusing MZPs is the fulfilling of the Bragg condition across the zone plate. To achieve this, the zones are tilted. The tilting was a central point in our investigations. It was also studied with the MZP used in our latest experiments carried out at DESY. [1] Eberl, C. et al. Appl. Surf. Sci. 307 (2014) [2] Salditt, T. et al. Phys. Rev. Lett. 115, 203902 (2015)