Article
Nanoscience & Nanotechnology
Xiaoliang He, Xingchen Pan, Hua Tao, Cheng Liu, Jianqiang Zhu
Summary: A linear model for coherent diffractive imaging (CDI) is proposed, which provides a unique solution for complex samples without any approximation. The proposed method is valid for all CDI-related imaging methods and the relationship between the method and the convergence of iterative phase retrieval is discussed. This mathematical model allows for analyzing the underlying physics of CDI and predicting the accuracy and error in CDI applications.
Article
Optics
Dongyu Yang, Junhao Zhang, Ye Tao, Wenjin Lv, Shun Lu, Hao Chen, Wenhui Xu, Yishi Shi
Summary: Deep CDI is a physics-driven untrained learning method that can reconstruct complex scenes from a single diffraction pattern with high confidence and fast reconstruction of dynamic processes.
Article
Materials Science, Multidisciplinary
Yuan Gao, Xiaojing Huang, Ross Harder, Wonsuk Cha, Garth J. Williams, Hanfei Yan
Summary: Bragg coherent diffractive imaging (BCDI) is a noninvasive microscopy technique that can visualize the shape and internal lattice deviations of crystals with nanoscale spatial resolution and picometer deformation sensitivity. However, its application is limited by the kinematical approximation, which prevents its use on larger crystals. Therefore, understanding the dynamical effect of BCDI and developing simulation methods are crucial for expanding its applicability.
Article
Engineering, Electrical & Electronic
Cheng-Wei Hsu, Ping Lu, Pei-Chi Huang, Jia-Ru Yu, Chi Chen, Shang-Da Yang, Chien-Chun Chen
Summary: We have developed a new algorithm called gPIE, which improves upon the conventional ePIE method by applying optimization concepts. Compared to ePIE, gPIE is able to reconstruct samples and illumination more accurately, revealing the correct surface topology.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Tingting Wu, Xingqian Zhao, Junyao Ma
Summary: This paper proposes a framework called Pi-Net, based on a double-branch network, to solve the complex problem of coherent diffractive imaging. By analyzing the performance of various activation functions, the crucial role of activation function in phase retrieval is discovered. Numerical experiments demonstrate the robustness of Pi-Net and superior reconstruction results compared to state-of-the-art methods.
DIGITAL SIGNAL PROCESSING
(2022)
Article
Physics, Multidisciplinary
Jakob Soltau, Markus Osterhoff, Tim Salditt
Summary: This novel approach to x-ray microscopy combines a multilayer zone plate with an iterative phase retrieval scheme to achieve high resolution and quantitative phase contrast.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Haozhi Sha, Jizhe Cui, Rong Yu
Summary: In this study, we propose an efficient and robust method to correct specimen misorientation in electron ptychography, enabling deep sub-angstrom resolution imaging for specimens with large misorientations. The method reduces experimental difficulties and paves the way for widespread applications of ptychographic deep sub-angstrom resolution imaging.
Article
Optics
Zhiming Tian, Ming Zhao, Sen Wang, Ning Zou, Jian Li, Junchao Feng
Summary: This work proposes a novel optimization algorithm and cost function for reconstructing undersampled data in meter-scale reflective Fourier ptychographic imaging. The proposed method achieves the same performance as the alternative-projection-based algorithm but with much less data.
Article
Optics
Hao Zhu, Zhen Liu, You Zhou, Zhan Ma, Xun Cao
Summary: Lensless imaging is a reliable method for observing microscopic scenes and has various applications. We propose a novel unsupervised Diffractive Neural Field (DNF) method that accurately characterizes the imaging process and achieves precise reconstruction of complex fields using limited measurements. Simulation and experimental results show the superior performance and potential of the proposed method.
Article
Optics
Bingyang Wang, Zhenfei He, Fucai Zhang
Summary: The proposed improved algorithm allows for recovery of the transmission function of a completely unknown modulator during the iterative process of image reconstruction, making CMI a more practical technique. This improvement has been verified through simulations and optical experiments.
Article
Chemistry, Multidisciplinary
Gerard N. Hinsley, Cameron M. Kewish, Grant A. van Riessen
Summary: This work demonstrates by simulation that kilohertz synchrotron CDI is possible by making use of redundant information from static parts of the image field. Reconstruction ambiguities are strongly suppressed by applying a spatiotemporal constraint. Dynamics an order of magnitude faster can be reconstructed compared with conventional CDI.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Optics
Cheng Xu, Hui Pang, Axiu Cao, Qiling Deng, Song Hu, Huajun Yang
Summary: In this paper, a novel lensless imaging approach based on ptychography and wavefront separation is proposed. This approach has the advantages of rapid convergence and high-quality imaging. By using an amplitude modulator to modulate the light wave, a sequence of modulated intensity images can be acquired for object recovery. Optical experiments were conducted to validate the feasibility of this approach.
Article
Biochemical Research Methods
Pengming Song, Chengfei Guo, Shaowei Jiang, Tianbo Wang, Patrick Hu, Derek Hu, Zibang Zhang, Bin Feng, Guoan Zheng
Summary: This study presents a fully on-chip, lensless microscopy technique called optofluidic ptychography, which allows high-resolution quantitative complex imaging in a lab-on-a-chip setup. By integrating ptychographic microscopy into microfluidic devices, the technology can achieve high-resolution ptychographic reconstruction at video framerate and address a wide range of biomedical needs.
Article
Optics
Byungjae Hwang, Taeseong Woo, Cheolwoo Ahn, Jung-Hoon Park
Summary: A new phase retrieval method is proposed and demonstrated for imaging through random media. While methods for recovering the Fourier amplitude through random distortions are well established, recovering the Fourier phase has been a more difficult problem and remains an active and important research area. The authors show that by ensemble averaging shift-corrected images, the Fourier phase of an object obscured by random distortions can be accurately retrieved up to the diffraction limit. The method is simple, fast, and does not require any optimization parameters or prior knowledge about the sample.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Tianhao Ruan, Wenjin Lv, Ye Tao, Junhao Zhang, Xutong Yan, Dongyu Yang, Yishi Shi
Summary: In this paper, we propose an autofocusing strategy based on an adaptive Lp-norm total variation model, which achieves high accuracy of convergence on various types of specimens and can handle poorly estimated specimen-detector distance efficiently and stably.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Peng Li, Tega Edo, Darren Batey, John Rodenburg, Andrew Maiden
Article
Optics
Peng Li, Darren J. Batey, Tega B. Edo, Aaron D. Parsons, Christoph Rau, John M. Rodenburg
Article
Microscopy
Peng Li, Andrew M. Maiden
JOURNAL OF MICROSCOPY
(2018)
Article
Optics
Samuel McDermott, Peng Li, Gavin Williams, Andrew Maiden
Article
Optics
Andrew Maiden, Daniel Johnson, Peng Li
Article
Optics
Peng Li, Andrew Maiden
Article
Microscopy
S. Cao, A. M. Maiden, J. M. Rodenburg
Article
Multidisciplinary Sciences
Peng Li, Andrew Maiden
SCIENTIFIC REPORTS
(2018)
Editorial Material
Multidisciplinary Sciences
John Rodenburg
Article
Optics
Daniel Claus, John Marius Rodenburg
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2019)
Article
Microscopy
Peng Li, Darren Batey, John Rodenburg
Proceedings Paper
Microscopy
Peng Li, Andrew Maiden
ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE 2017 (EMAG2017)
(2017)
Article
Optics
S. Cao, P. Kok, P. Li, A. M. Maiden, J. M. Rodenburg
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.
