Mainz 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
ST: Fachverband Strahlen- und Medizinphysik
ST 5: Postersitzung
ST 5.2: Poster
Wednesday, March 26, 2014, 17:30–19:00, ReWi EG
Gratings for DPCI: The state of the art — •Frieder Koch1, Jan Meiser1, Pascal Meyer1, Danays Kunka1, Max Amberger1, Marian Willner2, and Jürgen Mohr1 — 1Karlsruher Institut für Technologie - Institut für Mikrostrukturtechnik, Eggenstein-Leopoldshafen — 2Technische Universität München, Lehrstuhl für Angewandte Biophysik (E17)
Talbot-Lau X-Ray Differential Phase Contrast Imaging (DPCI) has substantially gained interest in the last years due to its compatibility with X-Ray tube sources[1]. The technique is based on a three grating interferometer. The first grating, denoted G0, supplies the necessary spatial coherence, the second grating, G1, introduces an interference pattern that is analyzed with the help of the third grating, G2.
The requirements on the grating quality are very strict, they need to have very few to no defects and high homogeneity. Depending on the X-Ray energy, the grating structures of G0 and G2 also need to have extremely high aspect ratios of 100 and more. At the Karlsruhe Institute of Technology, Institute of Microstructure Technology these gratings are developed using the LIGA process. Deep X-Ray lithography and direct laser writing are used to structure a resist layer which is subsequently electroplated with gold or nickel to form the final grating.
We present the state of the art in grating fabrication, currently achievable structure dimensions and quality, and our work to push the limits in aspect ratio, grating period and area. In addition, we show examples of applications made possible by our gratings.
1.*Pfeiffer, F., et al., Nature Physics, 2006. 2(4): p. 258-261.