Fig. 1
From: Diffractive small angle X-ray scattering imaging for anisotropic structures
Fringe formation for a single unit cell. a Schematic of a single unit cell containing two diffractive annuli. b The periodic substructure of the annulus causes diffraction of the incoming X-rays. Given sufficient propagation the \(\pm\)1 diffraction orders have split and superimpose incoherently with the opposite orders generating the shown intensity modulation pattern. c Fabricated grating for \(17\ {\rm{keV}}\) containing one diffractive annulus of \(50\ \upmu {\rm{m}}\) period and \(1\ \upmu {\rm{m}}\) diffractive substructure, the scale bars for the inset and the overview image are 10 and \(100\ \upmu {\rm{m}}\), respectively. d Measured visibility for the grating in c in dependency on the propagation distance \(D\). The maximum visibility is observed at a distance of \(\frac{1}{2}\frac{P p_{1}}{\lambda }\) independently of the type of the diffractive structure. The insets represented the fringe from a single unit cell at the given distances. The scale bars correspond to \(20\ \upmu {\rm{m}}\). The width of the band corresponds to six times the observed standard deviation over the full field of view
