1997/10/20 by G. Schneider, Gerd Schneider · 2 citations
Physics and Astronomy · Materials Science · #Advanced X-ray Imaging Techniques #Optical Coatings and Gratings #Photorefractive and Nonlinear Optics
paper · doi:10.1063/1.120069
The coupled wave theory is applied to calculate the diffraction efficiency of zone plates used in high orders of diffraction. In contradiction to the existing understanding about 30%–50% of the incident intensity can be diffracted by a single high order if the line-to-space ratio of the zone structures is in the range of 0.1–0.5 and the aspect ratios are larger than 30:1. Highly efficient diffractive transmission x-ray optics with high numerical apertures and resolving power can be developed without manufacturing extremely small zones which are necessary for zone plates used in the first order.