波带板
光学
衍射
菲涅耳区
菲涅耳衍射
物理
热力学第零定律
菲涅耳区天线
菲涅耳数
计算机科学
天线(收音机)
电信
辐射模式
量子力学
缝隙天线
作者
D. Haberberger,A. Shvydky,P. M. Nilson,S. T. Ivancic,D. H. Froula
摘要
Fresnel zone plates (FZPs) are circular diffractive elements that operate as a lens for x-rays. They have gained interest in the field of laser-plasma physics due to their ability to achieve higher spatial resolution than pinholes. Their design and implementation are complicated by the fact that a significant amount of the x-rays passing through the FZP will not diffract (zeroth order) and present a background to the measurement. This background can be large and inhomogeneous depending on the geometric setup of the experiment. Here, we present calculations of the diffracted (first order) and un-diffracted (zeroth order) flux profiles, which makes it possible to optimize the contrast between the first order imaging rays and the zeroth order background. Calculations for the implementation of a central block in the FZP, designed to block the zeroth from the entire field of view, are also presented.
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