Reconstruction numérique

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Optical ptychography

Principal investigator : Patrick Ferrand

In the optical regime, ptychography is becoming a new competitive microscopy method mostly thanks to its capability to image quantitatively the phase shift introduced by the sample.

Recently, we have addressed the issue of anisotropic samples, probed by polarized light. A vectorial propagation formalism was introduced to derive a phase retrieval algorithm aiming at reconstructing the full polarization-related properties of an object (see figure), from measurements taken under an appropriate set of prepared and analyzed polarization states.

This opens new possibilities of imaging specimen having anisotropic properties, including birefringence or optical activity.

Fundings : This work is funded by the French ANR under contract no ANR-11-BS10-0005 and by the European Research Council (ERC) under the European Union’s Horizon H2020 research and innovation program grant agreement No 724881.