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
Optics
Konstantin Kharitonov, Masoud Mehrjoo, Mabel Ruiz-Lopez, Barbara Keitel, Svea Kreis, Martin Seyrich, Mihai Pop, Elke Plonjes
Summary: Ptychography is a scanning coherent diffraction imaging method that can produce high-resolution reconstructions of samples and illuminating beams. However, the shot-to-shot pulse fluctuations and partial spatial coherence of FELs can lead to numerical complexities, limiting its application. A new adaptive forward model based on automatic differentiation was proposed to address these issues and successfully applied in an experiment at the FLASH facility.
Article
Optics
Zhenjiang Xing, Zijian Xu, Xiangzhi Zhang, Bo Chen, Zhi Guo, Jian Wang, Yong Wang, Renzhong Tai
Summary: Multi-slice ptychography (MSP) is a fast three-dimensional imaging technology that can achieve higher depth resolution and flexibility through a virtual depth-scan scheme.
Article
Biochemical Research Methods
Shaowei Jiang, Pengming Song, Tianbo Wang, Liming Yang, Ruihai Wang, Chengfei Guo, Bin Feng, Andrew Maiden, Guoan Zheng
Summary: Ptychography, originally used for determining crystalline structures, is now a valuable imaging tool for microscopists. Recent developments have made it suitable for biomedical research, offering high-resolution, high-throughput optical imaging with minimal hardware modifications.
Review
Optics
Lars Loetgering, Stefan Witte, Jan Rothhardt
Summary: This review presents the latest developments in tabletop ptychography with high harmonic generation sources. It covers hardware options such as illumination optics and detector concepts, as well as algorithmic aspects in the analysis of multispectral ptychography data. Additionally, technological application cases such as multispectral wavefront sensing, attosecond pulse characterization, and depth-resolved imaging are reviewed.
Article
Multidisciplinary Sciences
Zhen Chen, Yi Jiang, Yu-Tsun Shao, Megan E. Holtz, Michal Odstrcil, Manuel Guizar-Sicairos, Isabelle Hanke, Steffen Ganschow, Darrell G. Schlom, David A. Muller
Summary: Transmission electron microscopes use electrons with wavelengths of a few picometers to potentially image individual atoms in solids, but their image resolution is often reduced by lens aberrations and electron scattering. By using electron ptychography to solve these issues, researchers have achieved higher image resolution and precision in locating embedded atoms.
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
Computer Science, Artificial Intelligence
Francesco Guzzi, George Kourousias, Fulvio Bille, Roberto Pugliese, Alessandra Gianoncelli, Sergio Carrato
Summary: This article introduces Sci-ComPty, a software framework that aims to simulate ptychography datasets and test advanced reconstruction algorithms. The software leverages GPU accelerated processing through the PyTorch CUDA interface, enabling the design of new methods. The authors also present improved position refinement and rPIE algorithms, with results shown on synthetic and real datasets.
PEERJ COMPUTER SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Siwei Tao, Congxiao He, Xiang Hao, Cuifang Kuang, Xu Liu
Summary: Recent advances in X-ray technology have led to improvements in imaging techniques, with phase-contrast imaging offering higher contrast than absorption imaging, particularly for materials with low atomic numbers. Understanding the principles and recent progress of X-ray phase-contrast imaging methods can help in their potential applications in various fields.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
David Simonne, Jerome Carnis, Clement Atlan, Corentin Chatelier, Vincent Favre-Nicolin, Maxime Dupraz, Steven J. Leake, Edoardo Zatterin, Andrea Resta, Alessandro Coati, Marie-Ingrid Richard
Summary: Gwaihir is a user-friendly and open-source tool for processing and analyzing Bragg coherent X-ray diffraction data. It integrates the functionalities of existing packages, providing an interactive approach for data analysis and promoting data reproducibility.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
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
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
Chemistry, Multidisciplinary
Guanxing Li, Hui Zhang, Yu Han
Summary: Recent advances in high-speed pixelated electron detectors have greatly facilitated the implementation of four-dimensional scanning transmission electron microscopy (4D-STEM). A key application of 4D-STEM is electron ptychography, which reveals the atomic structure of a specimen by reconstructing its transmission function from electron diffraction patterns. However, this emerging technique has not been fully applied to materials sensitive to electron beams.
ACS CENTRAL SCIENCE
(2022)
Article
Multidisciplinary Sciences
Daniel Keefer, Flavia Aleotti, Jeremy R. Rouxel, Francesco Segatta, Bing Gu, Artur Nenov, Marco Garavelli, Shaul Mukamel
Summary: X-ray diffraction is commonly used for structure determination of stationary molecular samples, but modern X-ray photon sources can provide temporal resolution to these scattering events. Studying the femtosecond isomerization of azobenzene, researchers simulate and decipher various contributions to the X-ray diffraction pattern and discuss methods to retrieve information by employing very hard X-rays.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Longlong Wu, Pavol Juhas, Shinjae Yoo, Ian Robinson
Summary: This study presents a method to estimate the complex single-particle image quickly and accurately using a deep neural network model, and further enhance the accuracy of the reconstructed results by combining it with traditional iterative methods. Improved convergence is demonstrated with experimental BCDI data.
Article
Chemistry, Physical
Tadesse A. Assefa, Ana F. Suzana, Longlong Wu, Robert J. Koch, Luxi Li, Wonsuk Cha, Ross J. Harder, Emil S. Bozin, Feng Wang, Ian K. Robinson
Summary: The study utilized BCDI and XRD techniques to observe the phase transformation occurring within a single LTO nanoparticle during discharge. It found the formation of phase domains of 200 nm in size during the two-phase stage, and observed a lattice contraction of >0.2% in a single LTO nanoparticle.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Biochemistry & Molecular Biology
S. W. Botchway, S. Farooq, A. Sajid, I. K. Robinson, M. Yusuf
Summary: The organization of chromatin into higher-order structures and its condensation process is crucial in understanding disease states. Advanced imaging methods like FLIM and SRM have provided insight into mitotic chromosome structure, with SRM capable of DNA imaging below 50 nm resolution and FLIM potentially providing information below 20 nm. Both techniques offer nanometer-level fluorescence imaging and have contributed to mitotic chromosome studies, showcasing potential for future advancements in chromosome science.
CHROMOSOME RESEARCH
(2021)
Correction
Biochemistry & Molecular Biology
S. W. Botchway, S. Farooq, A. Sajid, I. K. Robinson, M. Yusuf
CHROMOSOME RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Archana Bhartiya, Darren Batey, Silvia Cipiccia, Xiaowen Shi, Christoph Rau, Stanley Botchway, Mohammed Yusuf, Ian K. Robinson
Summary: This study used hard X-ray ptychography to extract the individual masses of all 46 chromosomes of metaphase human B and T cells, producing 'X-ray karyotypes' to determine the effect of low-level X-ray irradiation on genetic material. The experiments were conducted at the I-13 beamline of Diamond Light Source in the UK using phase-sensitive X-ray ptychography method.
CHROMOSOME RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Fei Yang, Xianping Liu, Peiming Wang, Shunfeng Wang, Ian Robinson, Bo Chen
Summary: Hardened tricalcium silicate (C3S) pastes cured for different times were studied using SBFSEM to analyze their three-dimensional spatial structures and morphological characteristics. Results showed the high reactivity of C3S with water and the complex process of pore network formation. SBFSEM was proven to be applicable in the field of cement-based materials through quantitative analysis compared with traditional methods.
MATERIALS CHARACTERIZATION
(2021)
Article
Biochemistry & Molecular Biology
Archana Bhartiya, Ian Robinson, Mohammed Yusuf, Stanley W. Botchway
Summary: This paper introduces a method combining DAPI, FLIM, and M-FISH techniques to understand the nanometer structure of all 46 chromosomes in the nucleus covering the entire human genome at the single cell level. This approach enables the study and observation of structural differences in chromosomes.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2021)
Article
Materials Science, Multidisciplinary
H. Miao, G. Fabbris, R. J. Koch, D. G. Mazzone, C. S. Nelson, R. Acevedo-Esteves, G. D. Gu, Y. Li, T. Yilimaz, K. Kaznatcheev, E. Vescovo, M. Oda, T. Kurosawa, N. Momono, T. Assefa, I. K. Robinson, E. S. Bozin, J. M. Tranquada, P. D. Johnson, M. P. M. Dean
Summary: This study demonstrates that CDW correlations in La2-xSrxCuO4 persist up to a doping of at least x=0.21, with strong changes through the superconducting transition. Despite changes in Fermi surface topology and electronic transport at the critical doping value of x(c)approximate to 0.19, there is no obvious discontinuity, prompting a reconsideration of the role of CDW correlations in the high-temperature cuprate phase diagram.
NPJ QUANTUM MATERIALS
(2021)
Correction
Biochemistry & Molecular Biology
Archana Bhartiya, Darren Batey, Silvia Cipiccia, Xiaowen Shi, Christoph Rau, Stanley Botchway, Mohammed Yusuf, Ian K. Robinson
CHROMOSOME RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Xiang Liu, Xinwei Zhou, Qiang Liu, Jiecheng Diao, Chen Zhao, Luxi Li, Yuzi Liu, Wenqian Xu, Amine Daali, Ross Harder, Ian K. Robinson, Mouad Dahbi, Jones Alami, Guohua Chen, Gui-Liang Xu, Khalil Amine
Summary: This study reveals the mechanism of how a poly(3,4-ethylenedioxythiophene) coating regulates the high-temperature operational tolerance of cathodes, preventing multiple degradation pathways from occurring.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Min Gyu Kim, Andi Barbour, Wen Hu, Stuart B. Wilkins, Ian K. Robinson, Mark P. M. Dean, Junjie Yang, Choongjae Won, Sang-Wook Cheong, Claudio Mazzoli, Valery Kiryukhin
Summary: Magnetic domains in antiferromagnetic materials are crucial for understanding magnetism and its applications. In this study, videos of fluctuating antiferromagnetic domains in Ni2MnTeO6 were obtained using coherent x-ray diffraction. The findings highlight the potential significance of dynamic domain imaging in phase transition studies and magnetic device research.
Article
Chemistry, Multidisciplinary
Ana F. Suzana, Sizhan Liu, Jiecheng Diao, Longlong Wu, Tadesse A. Assefa, Milinda Abeykoon, Ross Harder, Wonsuk Cha, Emil S. Bozin, Ian K. Robinson
Summary: When synthesized under certain conditions, barium titanate (BTO) nanoparticles show a non-thermodynamic cubic structure and have an enhanced dielectric constant. These nanoparticles are widely used in thin-layer capacitors. Characterization methods, including X-ray refinement and the Williamson-Hall approach, reveal the presence of notable strain associated with the cubic phase. However, X-ray pair distribution function measurements indicate a lower symmetry local structure.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Physical
Ralf F. F. Ziesche, Thomas M. M. Heenan, Pooja Kumari, Jarrod Williams, Weiqun Li, Matthew E. E. Curd, Timothy L. L. Burnett, Ian Robinson, Dan J. L. Brett, Matthias J. J. Ehrhardt, Paul D. D. Quinn, Layla B. B. Mehdi, Philip J. J. Withers, Melanie M. M. Britton, Nigel D. D. Browning, Paul R. R. Shearing
Summary: The demand for low carbon energy storage has emphasized the importance of imaging techniques in characterizing electrode microstructures, determining key parameters for battery manufacture, operation, degradation, and failure in both next generation lithium batteries and other novel battery systems. This review summarizes recent progress and highlights in magnetic resonance, neutron, X-ray, focused ion beam, scanning and transmission electron microscopy. Two major trends are identified: the use of multi-modal microscopy in a correlative fashion, providing contrast modes across length and time scales, and the application of machine learning to guide data collection and analysis, recognizing the role of these tools in evaluating large data streams from increasingly sophisticated imaging experiments.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Longlong Wu, Seongmin Bak, Youngho Shin, Yong S. Chu, Shinjae Yoo, Ian K. Robinson, Xiaojing Huang
Summary: Multimodal hard X-ray scanning probe microscopy combines ptychography with X-ray fluorescence (XRF) microscopy to study functional materials, providing both structural and chemical information. A machine learning model is developed to enhance spatial resolution by decoupling the effect of X-ray probe from the XRF signal, showing superior performance compared to traditional scanning XRF methods. The proposed method can be widely applied in functional materials and biological imaging with XRF microscopy and related applications.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wei Wang, Junjie Li, Lijun Wu, Jennifer Sears, Fuhao Ji, Xiaozhe Shen, Alex H. Reid, Jing Tao, Ian K. Robinson, Yimei Zhu, Mark P. M. Dean
Summary: This study investigates the interplay between charge order and lattice distortions in magnetite using ultrafast electron diffraction, and explains the mechanism of the Verwey transition through transient structural evolution.
