Ali Sajid, Jacobsen Chris
J Opt Soc Am A Opt Image Sci Vis. 2020 Mar 1;37(3):374-383. doi: 10.1364/JOSAA.380925.
Fresnel zone plates are frequently used as focusing and imaging optics in x-ray microscopy, as they provide the ease of use of normal incidence optics. We consider here the effects of tilt misalignment on their optical performance, both in the thin optics limit and in the case of zone plates that are sufficiently thick so that volume diffraction effects come into play. Using multislice propagation, we show that simple analytical models describe the tilt sensitivity of thin zone plates and the thickness at which volume diffraction must be considered, and examine numerically the performance of example zone plates for soft x-ray focusing at 0.5 keV and hard x-ray focusing at 10 keV.
菲涅耳波带片经常被用作X射线显微镜中的聚焦和成像光学元件，因为它们具有垂直入射光学元件易于使用的特点。我们在此考虑倾斜失准对其光学性能的影响，包括在薄光学极限情况下以及波带片足够厚以至于体衍射效应起作用的情况。通过多层传播，我们表明简单的解析模型可以描述薄波带片的倾斜灵敏度以及必须考虑体衍射的厚度，并通过数值方法研究了用于0.5keV软X射线聚焦和10keV硬X射线聚焦的示例波带片的性能。
