We report an experimental ptychography measurement performed in fly-scan mode. With a visible-light laser source, we demonstrate a 5-fold reduction of data acquisition time. By including multiple mutually incoherent modes into the incident illumination, high quality images were successfully reconstructed from blurry diffraction patterns. This approach significantly increases the throughput of ptychography, especially for three-dimensional applications and the visualization of dynamic systems.
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| http://dx.doi.org/10.1038/srep09074 | DOI Listing |
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Recent advancements in ptychography have demonstrated the potential of coded ptychography (CP) for high-resolution optical imaging in a lensless configuration. However, CP suffers imaging throughput limitations due to scanning inefficiencies. To address this, we propose what we believe is a novel 'fly-scan' scanning strategy utilizing two eccentric rotating mass (ERM) vibration motors for high-throughput coded ptychographic microscopy.
View Article and Find Full Text PDFThe Velociprobe: An ultrafast hard X-ray nanoprobe for high-resolution ptychographic imaging.
Rev Sci Instrum
August 2019
Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA.
Motivated by the advanced photon source upgrade, a new hard X-ray microscope called "Velociprobe" has been recently designed and built for fast ptychographic imaging with high spatial resolution. We are addressing the challenges of high-resolution and fast scanning with novel hardware designs, advanced motion controls, and new data acquisition strategies, including the use of high-bandwidth interferometric measurements. The use of granite, air-bearing-supported stages provides the necessary long travel ranges for coarse motion to accommodate real samples and variable energy operation while remaining highly stable during fine scanning.
View Article and Find Full Text PDFPtychography is a coherent diffractive imaging method that can provide a diffraction-limited, robust reconstruction of the sample's complex transmission function without the use of high-quality optics. However, the scanning nature of conventional X-ray ptychography unavoidably requires the mechanical motion of either the illumination probe or the sample. In order to avoid overhead related to breaking and acceleration for every scan position, so-called fly-scan methods were developed.
View Article and Find Full Text PDFPartially coherent ptychography by gradient decomposition of the probe.
Acta Crystallogr A Found Adv
May 2018
Computational Research Division, Lawrence Berkeley National Laboratory, USA.
Coherent ptychographic imaging experiments often discard the majority of the flux from a light source to define the coherence of the illumination. Even when the coherent flux is sufficient, the stability required during an exposure is another important limiting factor. Partial coherence analysis can considerably reduce these limitations.
View Article and Find Full Text PDFAdvances and challenges in cryo ptychography at the Advanced Photon Source.
AIP Conf Proc
January 2016
X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA; Department of Physics & Astronomy and Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA.
Ptychography has emerged as a nondestructive tool to quantitatively study extended samples at a high spatial resolution. In this manuscript, we report on recent developments from our team. We have combined cryo ptychography and fluorescence microscopy to provide simultaneous views of ultrastructure and elemental composition, we have developed multi-GPU parallel computation to speed up ptychographic reconstructions, and we have implemented fly-scan ptychography to allow for faster data acquisition.
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