Open AccessWavefield back-propagation in high-resolution X-ray holography with a movable field of view
Author(s) -
Erik Guehrs,
C. Günther,
Bastian Pfau,
Torbjörn Rander,
S. Schaffert,
W. F. Schlotter,
Stefan Eisebitt
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.018922
Subject(s) - holography , optics , fourier transform , depth of field , spatial frequency , digital holography , sample (material) , physics , image resolution , resolution (logic) , micrometer , wavelength , point spread function , computer science , artificial intelligence , quantum mechanics , thermodynamics
Mask-based Fourier transform holography is used to record images of biological objects with 2.2 nm X-ray wavelength. The holography mask and the object are decoupled from each other which allows us to move the field of view over a large area over the sample. Due to the separation of the mask and the sample on different X-ray windows, a gap between both windows in the micrometer range typically exists. Using standard Fourier transform holography, focussed images of the sample can directly be reconstructed only for gap distances within the setup's depth of field. Here, we image diatoms as function of the gap distance and demonstrate the possibility to recover focussed images via a wavefield back-propagation technique. The limitations of our approach with respect to large separations are mainly associated with deviations from flat-field illumination of the object.