Kang Jungmin, Takazawa Shuntaro, Ishiguro Nozomu, Takahashi Yukio
Opt Express. 2021 Jan 18;29(2):1441-1453. doi: 10.1364/OE.414341.
We propose a method of single-frame coherent diffraction imaging using a triangular aperture, which can not only reconstruct the projection image of extended objects from a single-frame coherent diffraction pattern, but also improve the image of the wavefield of the probe. In this method, a plane-wave illuminates a triangular aperture. An object is placed immediately after the aperture or in the image plane of the aperture through a lens. A far-field coherent diffraction pattern is collected by a two-dimensional detector. The object image is reconstructed from the single-frame diffraction pattern using a phase retrieval algorithm without support constraints. We simulate feasible experimental setups in the hard X-ray regime and show that this method can be practical use for single-frame coherent diffraction imaging. The present method has the potential exploring dynamic phenomena in materials science and biology with high spatiotemporal resolution using synchrotron radiation/free-electron lasers.
我们提出了一种使用三角形孔径的单帧相干衍射成像方法，该方法不仅可以从单帧相干衍射图案重建扩展物体的投影图像，还可以改善探针波场的图像。在该方法中，平面波照射三角形孔径。物体紧接在孔径之后放置，或者通过透镜放置在孔径的像平面中。二维探测器收集远场相干衍射图案。使用无支撑约束的相位恢复算法从单帧衍射图案重建物体图像。我们在硬X射线区域模拟了可行的实验装置，并表明该方法可实际用于单帧相干衍射成像。本方法具有利用同步辐射/自由电子激光以高时空分辨率探索材料科学和生物学中的动态现象的潜力。
