AI 中文总结
本文表征了ASTRID2光源AU-SGM4光束线的消色差毛细管光学元件，实现XUV波段微纳聚焦，最小光束宽900 nm，可用于ARPES实验以研究微小样品。
AI 中文摘要
基于光发射的技术日益需要对同步辐射光源的极紫外（XUV）和软X射线波段光进行聚焦，减小光束宽度可用于研究更小的样品，如微观单晶体、工作中的二维（2D）异质结构及器件。然而，许多现有聚焦方法因光子能量范围有限或透射率低，无法充分利用同步辐射光束。现代毛细管光学元件已实现XUV和X射线光的消色差、高透射率聚焦。本文详细表征了安装在AU-SGM4光束线的该类消色差毛细管光学元件，用于ASTRID2光源的空间和角分辨光电子能谱（ARPES）实验。给出了毛细管透射率随光子能量的变化关系，测量了光束宽度、位置及透射率对光源尺寸的依赖关系。通过对光束选择性孔径化，可克服毛细管内表面斜率误差对光束远场图像的影响，在光发射几何结构中测得最小光束宽度为900 nm。
英文摘要
Focusing of synchrotron light across extreme ultraviolet (XUV) and soft X-ray regimes is increasingly desired for photoemission-based techniques where reduced beam width gives access to smaller samples such as microscopic single crystals and functioning two-dimensional (2D) heterostructures and devices. Many existing focusing methods, however, are not able to take full advantage of the synchrotron beam due to limited photon energy range or low transmission. Modern capillary optics have enabled achromatic, high transmission focusing of XUV and X-ray light. Here, we present a detailed characterisation of such an achromatic capillary optic installed at the AU-SGM4 beamline for spatial- and angle-resolved photoemission spectroscopy (ARPES) experiments at the ASTRID2 light source. The transmission of the capillary as a function of photon energy is given, and the dependence of the beam width, position, and transmission are measured against the source size. Analysis of the far-field image of the beam allows for slope errors on the inner surface of the capillary to be overcome by selectively aperturing the beam, resulting in a minimum beam width of 900 nm measured in a photoemission geometry.
