Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Nanostructures at Surfaces: Metals, Oxides and Semiconductors II

O 41.6: Vortrag

Dienstag, 21. März 2017, 15:15–15:30, REC/PHY C213

The diffuse scattering pattern from nanostructured surfaces — •Victor Soltwisch¹, Analia Fernandez Herrero¹, Mika Pflüger¹, Jürgen Probst², Anton Haase¹, and Frank Scholze¹ — ¹Physikalisch-Technische Bundesanstalt — ²Helmholtz-Zentrum Berlin

Laterally periodic nanostructures were investigated with grazing incidence small angle X-ray scattering. To support an improved reconstruction of nanostructured surface geometries, we investigated the origin of the contributions to the diffuse scattering pattern which is correlated to the surface roughness. Resonant diffuse scattering leads to a palm-like structure of intensity sheets. Dynamic scattering generates the so-called Yoneda band caused by a resonant scatter enhancement at the critical angle of total reflection and higher-order Yoneda bands originating from a subsequent diffraction of the Yoneda enhanced scattering at the grating. Our explanations are supported by modelling using a solver for the time-harmonic Maxwell's equations based on the finite-element method.