论文标题
通过层优化和稀疏矩阵分解的逆多层ptychography
Inverse Multislice Ptychography by Layer-wise Optimisation and Sparse Matrix Decomposition
论文作者
论文摘要
我们提出了基于优化方法的算法。电子显微镜。多层方法广泛用于模拟相对论电子与厚标本之间的相互作用。由于只能记录衍射模式的强度，因此应用逆多层ptychography的挑战是唯一地重建每个切片中的静电势，直到某些歧义。在这项概念研究中，我们表明，在考虑低加速度电压时，可以将原子层的独特分离用于模拟数据。我们还引入了一种适应来估计照明探针的改编。为了实际应用，我们最终使用实验4D扫描透射电子显微镜（STEM）数据提出了切片重建。
We propose algorithms based on an optimisation method for inverse multislice ptychography in, e.g. electron microscopy. The multislice method is widely used to model the interaction between relativistic electrons and thick specimens. Since only the intensity of diffraction patterns can be recorded, the challenge in applying inverse multislice ptychography is to uniquely reconstruct the electrostatic potential in each slice up to some ambiguities. In this conceptual study, we show that a unique separation of atomic layers for simulated data is possible when considering a low acceleration voltage. We also introduce an adaptation for estimating the illuminating probe. For the sake of practical application, we finally present slice reconstructions using experimental 4D scanning transmission electron microscopy (STEM) data.
