通过光子筛聚焦软X射线获得更清晰的图像。

Sharper images by focusing soft X-rays with photon sieves.

作者信息

Kipp L, Skibowski M, Johnson R L, Berndt R, Adelung R, Harm S, Seemann R

机构信息

Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany.

出版信息

Nature. 2001 Nov 8;414(6860):184-8. doi: 10.1038/35102526.

DOI:10.1038/35102526

PMID:11700552

Abstract

Fresnel zone plates consisting of alternating transmissive and opaque circular rings can be used to focus X-rays. The spatial resolution that can be achieved with these devices is of the order of the width of the outermost zone and is therefore limited by the smallest structure (20-40 nm) that can be fabricated by lithography today. Here we show that a large number of pinholes distributed appropriately over the Fresnel zones make it possible to focus soft X-rays to spot sizes smaller than the diameter of the smallest pinhole. In addition, higher orders of diffraction and secondary maxima can be suppressed by several orders of magnitude. In combination with the next generation of synchrotron light sources (free-electron lasers) these 'photon sieves' offer new opportunities for high-resolution X-ray microscopy and spectroscopy in physical and life sciences.

摘要

由交替的透射和不透明圆环组成的菲涅耳波带片可用于聚焦X射线。这些装置所能达到的空间分辨率约为最外层波带的宽度，因此受到如今光刻技术所能制造的最小结构（20 - 40纳米）的限制。在此我们表明，大量适当地分布在菲涅耳波带上的针孔能够将软X射线聚焦到小于最小针孔直径的光斑尺寸。此外，高阶衍射和次级极大可以被抑制几个数量级。与下一代同步辐射光源（自由电子激光）相结合，这些“光子筛”为物理和生命科学中的高分辨率X射线显微镜和光谱学提供了新的机遇。