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Fast Deterministic Ptychographic Imaging Using X-Rays

Published online by Cambridge University Press:  23 May 2014

Ada W. C. Yan ,
Adrian J. D’Alfonso ,
Andrew J. Morgan ,
Corey T. Putkunz  and
Leslie J. Allen
Ada W. C. Yan
Affiliation:
School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia
Adrian J. D’Alfonso
Affiliation:
School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia
Andrew J. Morgan
Affiliation:
School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia
Corey T. Putkunz
Affiliation:
School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia
Leslie J. Allen*
Affiliation:
School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia
*
*Corresponding author. lja@unimelb.edu.au
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Abstract

We present a deterministic approach to the ptychographic retrieval of the wave at the exit surface of a specimen of condensed matter illuminated by X-rays. The method is based on the solution of an overdetermined set of linear equations, and is robust to measurement noise. The set of linear equations is efficiently solved using the conjugate gradient least-squares method implemented using fast Fourier transforms. The method is demonstrated using a data set obtained from a gold–chromium nanostructured test object. It is shown that the transmission function retrieved by this linear method is quantitatively comparable with established methods of ptychography, with a large decrease in computational time, and is thus a good candidate for real-time reconstruction.

Keywords

coherent diffractive imagingexit-wave reconstructionptychographylensless imagingphase retrievalX-ray imaging
Type
FEMMS Special Issue
Information
Microscopy and Microanalysis , Volume 20 , Issue 4 , August 2014 , pp. 1090 - 1099
Copyright
© Microscopy Society of America 2014 

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