Interpretable and Efficient Interferometric Contrast in Scanning Transmission Electron Microscopy with a Diffraction-Grating Beam Splitter
Interpretable and Efficient Interferometric Contrast in Scanning Transmission Electron Microscopy with a Diffraction-Grating Beam Splitter
复制标题
使用衍射光栅分束器在扫描透射电子显微镜中实现可解释且高效的干涉对比
DOI：
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发表时间：
2018
影响因子：
4.6
通讯作者：
C. Ophus
中科院分区：
文献类型：
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作者：
Tyler R. Harvey;F. Yasin;J. Chess;J. Pierce;R. D. Reis;V. B. Ozdol;P. Ercius;J. Ciston;Wenchun Feng;N. Kotov;B. McMorran;C. Ophus
作者：Harvey， TR；Yasin FS;国际象棋,JJ;皮尔斯,JS;Dos Reis， RMS；Ozdol, VB;Ercius P;Ciston J;冯,W;Kotov NA;讲,BJ;摘要：©2018美国物理学会。生物分子、二维材料和电磁场的有效成像依赖于传输电子相位的检索。我们展示了一种在扫描透射电子显微镜（STEM）中测量相位的方法，该方法使用纳米制造的衍射光栅来产生多个探针光束。在没有离轴参考波的情况下，测量的相位比相衬扫描透射电子显微镜技术更容易解释，并且分辨率可以超过离轴电子全息。我们将这项技术，称为STEM全息术，应用于纳米颗粒、碳基板和电场的成像。实验中观察到的对比与模拟中预测的对比吻合得很好。
Author(s): Harvey, TR; Yasin, FS; Chess, JJ; Pierce, JS; Dos Reis, RMS; Ozdol, VB; Ercius, P; Ciston, J; Feng, W; Kotov, NA; McMorran, BJ; Ophus, C | Abstract: © 2018 American Physical Society. Efficient imaging of biomolecules, two-dimensional materials, and electromagnetic fields depends on retrieval of the phase of transmitted electrons. We demonstrate a method to measure phase in a scanning transmission electron microscope (STEM) using a nanofabricated diffraction grating to produce multiple probe beams. The measured phase is more interpretable than phase-contrast scanning transmission electron microscopy techniques without an off-axis reference wave, and the resolution could surpass that of off-axis electron holography. We apply this technique, called STEM holography, to image nanoparticles, carbon substrates, and electric fields. The contrast observed in experiments agrees well with contrast predicted in simulations.