Angular spectrum simulation of X-ray focusing by Fresnel zone plates

An efficient computing simulation routine has been implemented to model explicitly several types of Fresnel zone plate taking advantage of the circular symmetry. This code was used to evaluate an optimized approach for stacking of two high-resolution Fresnel zone plates.

Periodically structured X-ray waveguides

Theoretical considerations and experimental results on X-ray vacuum-gap waveguides with additional periodic structure on one of the reflecting walls are reported.