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Proceedings Paper

Simulations and surface quality testing of high asymmetry angle x-ray crystal monochromators for advanced x-ray imaging applications
Author(s): Z. Zápražný; D. Korytár; P. Šiffalovič; M. Jergel; M. Demydenko; P. Mikulík; E. Dobročka; C. Ferrari; P. Vagovič; M. Mikloška
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Paper Abstract

Advanced X-ray imaging techniques of weakly absorbing structures require an increase of the sensitivity to small refractive angles considering that they are based more on coherent X-ray phase contrast than on X-ray absorption one. Simulations of diffraction properties of germanium (Ge) X-ray crystal monochromators and of analyzer based imaging (ABI) method were performed for various asymmetry factors and several lattice plane orientations using an X-ray energy range from 8 keV to 20 keV. Using an appropriate phase/amplitude retrieval method one can recover the phase information from the ABI image, which is directly proportional to the projected electron density. We are using germanium based optics for X-ray imaging or image magnification. The use of Ge crystals offers several advantages over silicon crystals. The integrated reflectivity of Ge crystals is two to three times larger than that of Si crystals. The spatial resolution of Ge magnifiers is typically two times better than the spatial resolution of Si magnifiers. We used high asymmetry diffractions to increase effectively the propagation distance and decrease the effective pixel size of the detector, to achieve a sufficient magnification of the sample and to improve coherence and increase output intensity. The most important parameter of a highly asymmetric monochromators as image magnifiers is the crystal surface quality. We have applied several crystal surface finishing methods including conventional mechanical lapping, chemical polishing, chemo-mechanical polishing and advanced nano-machining using single point diamond turning (SPDT), and we have evaluated these methods by means of AFM, diffractometry, reciprocal space mapping and others.

Paper Details

Date Published: 5 September 2014
PDF: 14 pages
Proc. SPIE 9207, Advances in X-Ray/EUV Optics and Components IX, 92070Y (5 September 2014); doi: 10.1117/12.2061353
Show Author Affiliations
Z. Zápražný, Institute of Electrical Engineering (Slovakia)
D. Korytár, Institute of Electrical Engineering (Slovakia)
P. Šiffalovič, Institute of Physics (Slovakia)
M. Jergel, Institute of Physics (Slovakia)
M. Demydenko, Institute of Physics (Slovakia)
Sumy State Univ. (Ukraine)
P. Mikulík, Masaryk Univ. (Czech Republic)
E. Dobročka, Institute of Electrical Engineering (Slovakia)
C. Ferrari, Istituto dei Materiali per l Elettronica ed il Magnetismo, CNR (Italy)
P. Vagovič, Ctr. for Free-Electron Laser Science (Germany)
M. Mikloška, Integra TDS, s.r.o. (Slovakia)

Published in SPIE Proceedings Vol. 9207:
Advances in X-Ray/EUV Optics and Components IX
Christian Morawe; Ali M. Khounsary; Shunji Goto, Editor(s)

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