Phase retrieval by coherent modulation imaging

Fucai Zhang (), Bo Chen, Graeme R. Morrison, Joan Vila-Comamala, Manuel Guizar-Sicairos and Ian K. Robinson
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Fucai Zhang: London Centre for Nanotechnology, University College London
Bo Chen: London Centre for Nanotechnology, University College London
Graeme R. Morrison: London Centre for Nanotechnology, University College London
Joan Vila-Comamala: Swiss Light Source, Paul Scherrer Institut
Manuel Guizar-Sicairos: Swiss Light Source, Paul Scherrer Institut
Ian K. Robinson: London Centre for Nanotechnology, University College London

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Phase retrieval is a long-standing problem in imaging when only the intensity of the wavefield can be recorded. Coherent diffraction imaging is a lensless technique that uses iterative algorithms to recover amplitude and phase contrast images from diffraction intensity data. For general samples, phase retrieval from a single-diffraction pattern has been an algorithmic and experimental challenge. Here we report a method of phase retrieval that uses a known modulation of the sample exit wave. This coherent modulation imaging method removes inherent ambiguities of coherent diffraction imaging and uses a reliable, rapidly converging iterative algorithm involving three planes. It works for extended samples, does not require tight support for convergence and relaxes dynamic range requirements on the detector. Coherent modulation imaging provides a robust method for imaging in materials and biological science, while its single-shot capability will benefit the investigation of dynamical processes with pulsed sources, such as X-ray free-electron lasers.

Date: 2016
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DOI: 10.1038/ncomms13367

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