X-ray nanofocusing by kinoform lenses

Dr. H. Yan (National Synchrotron Light Source II, Brookhaven National Laboratory, USA) has recently reported a comparative study on various kinoform lenses for X-ray nanofocusing. He employed the geometrical theory, the dynamical diffraction theory, and the beam propagation method, and showed that the geometrical theory becomes invalid. The influence of the edge diffraction effect from the individual lens element was studied in view of the limit of the focus size. It was also shown that the length of the lenses can be optimized to reduce the wave field distortion. For more information, see the paper, "X-ray nanofocusing by kinoform lenses: A comparative study using different modeling approaches", H. Yan, Phys. Rev. B81, 075402 (2010).