Article
Optics
Zhitian Shi, Konstantins Jefimovs, Lucia Romano, Joan Vila-Comamala, Marco Stampanoni
Summary: Fabricating fan-shaped G0 source gratings improves the imaging field of view in laboratory grating-based X-ray interferometry, enhancing both the uniformity and angular sensitivity.
Article
Optics
Andrew M. Kingston, Wilfred K. Fullagar, Glenn R. Myers, Daishi Adams, Daniele Pelliccia, David M. Paganin
Summary: Classical ghost imaging is a computational imaging technique that reconstructs images from a set of measurements using patterned illumination, even though the imaging photons or particles are not directly recorded. Originally developed for visible-wavelength photons, it has been adapted for use with X rays, atomic beams, electrons, and neutrons. Improved signal-to-noise ratio capabilities of classical ghost imaging are limited to certain scenarios and are mainly due to increased dose (Fellgett advantage).
Article
Physics, Applied
Huiquan Li, Wanting Hou, Zhiyuan Ye, Tianyu Yuan, Shangkun Shao, Jun Xiong, Tianxi Sun, Xuepeng Sun
Summary: Ghost imaging is a technique that uses a single-pixel detector and structured illumination for compressive and lens-free image formation. The resolution in most x-ray ghost imaging schemes is limited by the unit size of structured illumination. To overcome this limitation, we introduced polycapillary optics into x-ray ghost imaging, which improved the resolution by approximately 3 times.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Haipeng Zhang, Ke Li, Feixiang Wang, Hong Yu, Changzhe Zhao, Guohao Du, Zhongliang Li, Biao Deng, Honglan Xie, Shensheng Han, Tiqiao Xiao
Summary: Reconstructing high-fidelity images with few measurements is a major challenge for X-ray ghost imaging (XGI), but the synthetic aperture XGI (SAXGI) combined with compressive sensing has shown promising results in experiments, providing a potential solution for practical applications of XGI.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Zhijie Tan, Hong Yu, Ruiguo Zhu, Ronghua Lu, Shensheng Han, Chaofan Xue, Shumin Yang, Yanqing Wu
Summary: The study introduces an X-ray single-exposure Fourier-transform ghost imaging (SFGI) approach, which can achieve Fourier information retrieval of unknown samples and has successfully demonstrated diffraction patterns in the experiment.
Article
Optics
David Ceddia, David M. Paganin
Summary: Ghost imaging and ghost projection are emerging techniques that use random masks for imaging and image projection. By weighting, selecting subsets, or optimizing the projection, any desired image can be projected. This technology has potential applications in data projectors, lithography, tomographic additive manufacturing, and ghost projection photocopiers.
Article
Optics
Andrew M. Kingston, Alaleh Aminzadeh, Lindon Roberts, Daniele Pelliccia, Imants D. Svalbe, David M. Paganin
Summary: Classical ghost imaging is a new imaging paradigm that involves using a set of illumination patterns and measuring the total interaction of an object for each pattern, rather than directly measuring the object's image with a pixelated detector. The image is computed through the correlation of each pattern and the corresponding bucket value. This paper explores the properties of masks or speckle in order to maximize ghost-image quality in a classical ghost-imaging setup using a transversely displaced but otherwise nonconfigurable mask.
Article
Physics, Multidisciplinary
Jun Wang, Taran Driver, Felix Allum, Christina C. Papadopoulou, Christopher Passow, Guenter Brenner, Siqi Li, Stefan Duesterer, Atia Tul Noor, Sonu Kumar, Philip H. Bucksbaum, Benjamin Erk, Ruaridh Forbes, James P. Cryan
Summary: We propose a method that combines photon spectrum correlation analysis with the reconstruction of three-dimensional momentum distribution from velocity map images in a single, efficient step. We demonstrate its effectiveness through the photoionization results of the 2p-shell of argon using the Free-electron LASer in Hamburg. Despite the large average bandwidth of the ionizing pulses from the FEL, we are able to resolve distinct spectral features caused by the spin-orbit splitting of Ar+(2p(-1)). Our approach surpasses conventional analysis methods and will be valuable for velocity map imaging experiments with FEL sources. The retrieved linewidth of the binding energy spectrum approaches the resolution limitation set by the spectrometers used to collect the data. Our approach provides a path to extend high-dimensional spectral-domain ghost imaging.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Haipeng Zhang, Ke Li, Changzhe Zhao, Jie Tang, Tiqiao Xiao
Summary: This paper proposes a method based on a modified compressive sensing algorithm with conjugate gradient descent method to address the issues encountered in X-ray ghost imaging. Simulation and experiments demonstrate the practicality and potential of the CGDGI-based method for efficient implementation of XGI.
Article
Optics
Kota Kumagai, Hsin-Hui Huang, Koji Hatanaka, Yoshio Hayasaki
Summary: Imaging and computational processing fusion technologies have expanded the range of wavelengths that can be visualized, but it is still challenging to image a wide range of wavelengths, including non-visible regions, in a single system. We propose a broadband imaging system based on femtosecond-laser-driven sequential light source arrays, which can form ultra-broadband illumination light based on the excitation target and pulse energy. We demonstrated X-ray and visible imaging under atmospheric pressure using a water film as the excitation target, and reduced imaging time while maintaining pixel count in the reconstructed image by applying a compressive sensing algorithm.
Article
Optics
Ignacio O. Romero, Yile Fang, Michael Lun, Changqing Li
Summary: XFCT is a molecular imaging technique used for sensing elements or nanoparticles in deep samples. A benchtop XFCT imaging system with a novel algorithm was proposed to achieve accurate and fast reconstruction of XFCT images, outperforming traditional algorithms.
Article
Physics, Multidisciplinary
Minghui Zhang, Huazhe Wei, Xianlong Liu, Bernhard J. Hoenders, Lina Guo, Yangjian Cai
Summary: The author predicted in [Opt. Lett. 38, 4023-4025 (2013)] that low coherent X-rays would have difficulty providing high-resolution diffraction patterns from objects with spatially periodic structures, which would greatly limit X-ray crystallography and similar techniques. In this letter, it is indicated that the Ghost diffraction technique can overcome this bottleneck by taking advantage of low coherence. Analytical formulas for calculating ghost diffraction patterns diffracted by periodic structured media under any coherent state are derived.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Applied
Johanna Schroeder, Jonathan Quinson, Jacob J. K. Kirkensgaard, Matthias Arenz
Summary: Small-angle X-ray scattering (SAXS) is a powerful technique for investigating the degradation of catalyst materials, ideally performed operando in synchrotron facilities. The challenge lies in proper background subtraction of carbon support to extract information on Pt nanoparticle size distribution during accelerated stress tests.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Yishai Klein, Alok K. Tripathi, Edward Strizhevsky, Flavio Capotondi, Dario De Angelis, Luca Giannessi, Matteo Pancaldi, Emanuele Pedersoli, Kevin C. Prince, Or Sefi, Young Yong Kim, Ivan A. Vartanyants, Sharon Shwartz
Summary: We present a simple and reliable high-resolution ghost spectroscopy method for x-ray and extreme ultraviolet transient absorption spectroscopy at free-electron laser sources. This method only requires an online spectrometer before the sample and a downstream bucket detector to retrieve the sample response. We validate the method by measuring absorption spectra of silicon-based materials and comparing the results with standard techniques.
Article
Optics
David Ceddia, Andrew M. Kingston, Daniele Pelliccia, Alexander Rack, David M. Paganin
Summary: Spatial light modulation is important for various applications, and we propose a new method called ghost projection that does not require configurable beam-shaping elements. Instead, this method displaces a single illuminated mask to create specific radiant exposure distributions. We study the effects and limitations of this method and investigate how to adapt it to spatially nonuniform illumination. These findings will help optimize experimental design and achieve practical ghost projection.
