Abstract
A new computational approach is suggested to the analysis of imaging properties of realistic X-ray Fresnel zone plates with high aspect ratio. Its mathematical basis is the parabolic wave equation (PWE) describing diffraction inside the zone plate body as well as wave propagation and focusing throughout the optical system. A finite-difference method is used for solving PWE in a truncated free-space domain with a perfectly transparent artificial boundary. The results of global wave field calculation are visualized by means of color graphics. Numerical estimates of resolution, diffraction efficiency and field of view enables one to compare imaging performance of realistic X-ray zone plates with an idealized plane Fresnel diffraction lens.
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