Article
Optics
Daniel S. Penagos Molina, Lars Loetgering, Wilhelm Eschen, Jens Limpert, Jan Rothhardt
Summary: We explore how spectral bandwidth and illumination curvature interact in ptychography. By adjusting the divergence of the illumination, broader spectral bandwidths can be accommodated without needing to modify the algorithmic forward model. A strong wavefront curvature changes the diffraction geometry from far-field to effectively near-field, reducing the impact of temporal coherence effects. The relaxed temporal coherence requirements enable the use of wider spectral bandwidths and larger illumination spots. Our findings pave the way for utilizing pink and broadband beams to enhance flux and throughput in synchrotron facilities and laboratory-scale beamlines.
Article
Optics
Xiaoli Ji, Xiaoliang He, Zhilong Jiang, Yan Kong, Shouyu Wang, Cheng Liu
Summary: By deducing a formula and conducting analytical analysis, the relationship among the highest achievable resolution of ptychographic iterative engine (PIE), its illumination angle, and its collection angle was discussed. Curved illumination was proposed to enhance the resolution for PIE, and a corresponding computing algorithm was proposed to avoid undersampling effect without increasing the size of the computing matrix, thus enabling high-resolution PIE imaging with a simple experimental setup. The feasibility of this proposed method was verified both numerically and experimentally.
Article
Optics
Lu Rong, Fangrui Tan, Dayong Wang, Yaya Zhang, Kunlun Li, Jie Zhao, Yunxin Wang
Summary: A new algorithm named EE-PIE is proposed to increase the lateral resolution of terahertz ptychography by using a divergent spherical beam for illumination, enhancing signal-to-noise ratio and diffraction pattern size. This method improves reconstruction quality and resolution without increasing setup complexity. The experimental results show significant improvement in resolution with the proposed algorithm.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Fan Liu, Qingru Li, Shurong Jiang, Liqiang Zhou, Jin Zhang, Han Zhang
Summary: This study introduces a new FP technique for TPSIM, which is shown to reduce the number of raw images and improve resolution through simulation results. This method enables TPSIM to achieve more efficient illumination patterns, shorter acquisition time, and less phototoxicity in live-cell imaging.
OPTICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Darren J. Batey, Frederic Van Assche, Sander Vanheule, Matthieu N. Boone, Andrew J. Parnell, Oleksandr O. Mykhaylyk, Christoph Rau, Silvia Cipiccia
Summary: This experiment demonstrated the successful application of X-ray ptychography in a small-scale laboratory setting, showcasing the potential for high-resolution phase contrast imaging to be performed at small-scale sources worldwide.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Fan Liu, Qingru Li, Shurong Jiang, Liqiang Zhou, Jin Zhang, Han Zhang
Summary: A new algorithm for super-resolution microscopy, termed as Fourier ptychographic (FP) technique, is introduced to reduce the number of raw images and enhance resolution effectively. This method enables faster, deeper, and safer live-cell imaging with fewer illumination patterns.
OPTICS COMMUNICATIONS
(2021)
Editorial Material
Physics, Multidisciplinary
Wendy S. Parker
Summary: Simulations play an essential role in science, but their outcomes are not considered as observations, as discussed by Wendy S. Parker.
Article
Materials Science, Multidisciplinary
Sheng Li, Bowen Wang, Kunyao Liang, Qian Chen, Chao Zuo
Summary: The remote Fourier ptychography (R-FP) technique is a promising super-resolution tool in non-interferometric synthetic aperture research. It overcomes the limitations of field-of-view attenuation and speckle noise in long-range FP imaging by utilizing quasi-plane wave illumination and the TVGF method. R-FP achieves the farthest detection range of macroscopic Fourier ptychographic imaging to date, showing potential for application in far-field detection.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Gianmaria Calisesi, Daniele Ancora, Carlotta Tacconi, Alessandro Fantin, Paola Perin, Roberto Pizzala, Gianluca Valentini, Andrea Farina, Andrea Bassi
Summary: Three-dimensional fluorescence microscopy is an important technology for inspecting biological samples. We propose a new method that suppresses illumination artifacts and reduces the required number of measurements. This method is applicable for imaging large transparent specimens or chemically cleared tissues. Using a tailored image reconstruction method, we demonstrate significant improvement in resolution.
MICROSCOPY AND MICROANALYSIS
(2022)
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
Biochemical Research Methods
Jiaxiong Luo, Haishu Tan, Ruofei Wu, Sicong Zhu, Hanbao Chen, Junrui Zhen, Jiancong Li, Caizhong Guan, Yanxiong Wu
Summary: Fourier ptychographic microscopy is a super-resolution computational imaging technology that stitches low-resolution images to obtain high-resolution phase images. However, its application in high-speed dynamic imaging is limited. To solve this problem, an adaptive-illumination FPM scheme using regional energy estimation is proposed, reducing data volume while ensuring imaging quality.
JOURNAL OF BIOPHOTONICS
(2023)
Article
Physics, Applied
Yi Jiang, Junjing Deng, Yudong Yao, Jeffrey A. Klug, Sheikh Mashrafi, Christian Roehrig, Curt Preissner, Fabricio S. Marin, Zhonghou Cai, Barry Lai, Stefan Vogt
Summary: The study demonstrates the use of advanced fly scan ptychography to achieve high-resolution imaging on a large field-of-view at millimeter scale, with significantly reduced imaging time by eliminating stage overheads. The implementation of orthogonal probe relaxation technique helps to overcome illumination variations and local vibrations during the imaging process.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Biomedical
Kunyang Sui, Marcello Meneghetti, Jaspreet Kaur, Roar Jakob Fleng Sorensen, Rune W. Berg, Christos Markos
Summary: This study presents the development of two flexible polymer optical fibers for efficient neuromodulation, featuring integrated microfluidic channels and an ultra-high numerical aperture. The proposed fibers have a larger illumination area and reduced bending stiffness compared to commercial silica fibers. Experimental results demonstrate their potential use as optical waveguides and in fiber photometry applications, paving the way for next-generation functional optical fibers in neuroscience.
JOURNAL OF NEURAL ENGINEERING
(2022)
Article
Optics
Timothy J. Schulz, David J. Brady, Chengyu Wang
Summary: In this study, we investigated the optimal Cramer-Rao lower bound on the mean-square error for estimating a coherent signal from photon-limited intensity measurements. We found that this bound can be achieved through specific systems, such as phase-quadrature holography. Additionally, we demonstrated the bounds for classic phase-retrieval and ptychography, highlighting that practical coding strategies can approach optimal performance.
Article
Optics
Moriya Rosenfeld, Gil Weinberg, Daniel Doktofsky, Yunzhe Li, Lei Tian, Ori Katz
Summary: The study introduces a computational imaging approach that enables optical diffraction-limited imaging using a conventional acousto-optic imaging system, with the potential for microscopic investigations.