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M: Metallphysik

M 34: Symposium Tomographic Methods in Materials Research

M 34.2: Vortrag

Montag, 7. März 2005, 17:20–17:40, TU H1058

Asymmetric Bragg Reflection As Magnifying X-Ray Optics — •Peter Modregger, Peter Schäfer, Daniel Lübbert, and Rolf Köhler — HU - Institut für Physik

Generally, the resolution limit for x-ray images is determined by available detectors (few 10µ m). The x-ray image magnification with asymmetric Bragg reflection is a promising way to overcome this resolution limit, simultaneously providing a high detector efficiency and a strong phase contrast. However, the imaging process is currently not understood in detail. With a theoretical description of the imaging process and numerical simulations we have shown that the resolution limit is in the sub-micrometer regime for pure absorption objects and that it even improves for the more realistic case of phase objects. In the latter case, it turns out that the resolution limit depends on the phase object itself. This technique of x-ray imaging can be combined with tomographic reconstruction and we have demonstrated the practicability using an object with almost absent absorption contrast.