David, C.Weitkamp, T.Pfeiffer, F.Diaz, A.Bruder, J.Rohbeck, T.Groso, A.Bunk, O.Stampanoni, M.Cloetens, P.2007-10-112007-10-112007-10-11200710.1016/j.sab.2007.03.001https://infoscience.epfl.ch/handle/20.500.14299/12851An interferometric technique for hard X-rays is presented. It is based on two transmission gratings and a phase-stepping technique, and it provides separate radiographs of the phase and absorption profiles of bulk samples. Tomographic reconstruction yields quantitative three-dimensional maps of the X-ray refractive index and of the attenuation coefficient, with a spatial resolution down to a few microns. The method is mechanically robust, it requires little monochromaticity, and can be scaled up to large fields of view. These are important prerequisites for use with laboratory X-ray sources. Numerous applications ranging from wave front sensing to medical radiography are presently under investigation.text::journal::journal article::research article