Fabrication of double-sided Fresnel zone plates and absolute measurements of their diffraction efficiency in an X-ray-tube-based setup

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/256477
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Type: Examensarbete för masterexamen
Master Thesis
Title: Fabrication of double-sided Fresnel zone plates and absolute measurements of their diffraction efficiency in an X-ray-tube-based setup
Authors: Yurgens, Viktoria
Abstract: Diffractive lenses for X-rays, so-called Fresnel zone plates (FZPs), are used as focusing elements in X-ray imaging applications in synchrotrons all over the world. One of the main characteristics of FZPs is their diffraction efficiency. Measurements of the absolute diffraction efficiency as a function of the X-ray energy can reliably be done using synchrotron radiation, but require beamtime at synchrotrons which is not available on a routine basis. Here, the design, construction and characterization of an in-lab X-ray-tube-based setup for measuring the absolute diffraction efficiency of single- and double-sided FZPs is presented. The broad spectrum from the Xray tube is monochromatized using a set of copper- and nickel filters, giving an approximate X-ray energy of 8.4 keV; the spectrum is simulated and confirmed through spectrometer measurements. Single- and double-sided line-doubled Fresnel zone plates with different characteristics have been fabricated and measured using the setup, yielding absolute diffraction efficiencies of up to 6.4%. Diffraction efficiency maps, showing the spatial distribution of the diffraction efficiency, have been obtained for each zone plate. The measurements have given important information regarding issues with the fabrication process related to the alignment between the two halves of double-sided zone plates, and these issues have been investigated further. Finally, measurements have been performed where the misalignment in double-sided zone plates has been determined by employing a functionality of the setup where the measured zone plates can be tilted around two different axes.
Keywords: Livsvetenskaper;Nanovetenskap och nanoteknik;Optik;Optisk fysik;Nanoteknik;Teknisk fysik;Life Science;Nanoscience & Nanotechnology;Optics;Optical physics;Nano Technology;Engineering physics
Issue Date: 2019
Publisher: Chalmers tekniska högskola / Institutionen för mikroteknologi och nanovetenskap
Chalmers University of Technology / Department of Microtechnology and Nanoscience
URI: https://hdl.handle.net/20.500.12380/256477
Collection:Examensarbeten för masterexamen // Master Theses



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