Fig. 1: 2D-Diffractive far-field neutron grating interferometer setup.
a Schematic of the experimental setup. From left to right: the neutron source, the absorbing source grating G0 with its lattice constant p0, the phase grating G1 with its lattice constant W1, the annular periodicity p1 and the sample and the detector. G1 is placed at a distance l from G0, while d is the space in between G1 and the detector. Ls is the sample to detector distance for the ξ-scan. The orientation of the sample fibers is color coded in blue, red and green, respectively to their angular displacement. The objects are depicted in a non-uniform scaling system. b Scanning electron microscopy (SEM) image of G1 of two adjacent unit cells highlighted by the orange box, while the dashed line separates them. Scale bar, 50 μm. c SEM image of a unit cell portion depicted by the yellow box and its local periodicity g1. Scale bar, 2 μm.
