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Material-specific high-resolution table-top extreme ultraviolet microscopy

Light(Science & Applications) 2022年第5期11卷 991-1000页

作者： Wilhelm Eschen Lars Loetgering Vittoria Schuster Robert Klas Alexander Kirsche Lutz Berthold michael steinert Thomas Pertsch Herbert Gross michael Krause Jens Limpert Jan Rothhardt Institute of Applied Physics Abbe Center of PhotonicsFriedrich-SchillerUniversität JenaAlbert-Einstein-Str.1507745 JenaGermany HelmholtzInstitute Jena Fröbelstieg 307743 JenaGermany Leibniz Institute of Photonic Technology Albert-Einstein-Straße 907745 JenaGermany Fraunhofer Institute for Microstructure of Materials and Systems IMWS WalterHülse-Str.106120 HalleGermany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str.707745 JenaGermany

Microscopy with extreme ultraviolet(EUV)radiation holds promise for high-resolution imaging with excellent material contrast,due to the short wavelength and numerous element-specific absorption edges available in this spectral *** the same time,EUV radiation has significantly larger penetration depths than *** thus enables a nano-scale view into complex three-dimensional structures that are important for material science,semiconductor metrology,and next-generation ***,we present high-resolution and material-specific microscopy at 13.5 nm *** combine a highly stable,high photon-flux,table-top EUV source with an interferometrically stabilized ptychography *** utilizing structured EUV illumination,we overcome the limitations of conventional EUV focusing optics and demonstrate high-resolution microscopy at a half-pitch lateral resolution of 16 ***,we propose mixed-state orthogonal probe relaxation ptychography,enabling robust phase-contrast imaging over wide fields of view and long acquisition *** this way,the complex transmission of an integrated circuit is precisely reconstructed,allowing for the classification of the material composition of mesoscopic semiconductor systems.

关键词： resolution ultraviolet extreme

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Visualizing the ultra-structure of microorganisms using table-top extreme ultraviolet imaging

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PhotoniX 2023年第1期4卷 605-619页

作者： Chang Liu Wilhelm Eschen Lars Loetgering Daniel S.Penagos Molina Robert Klas Alexander Iliou michael steinert Sebastian Herkersdorf Alexander Kirsche Thomas Pertsch Falk Hillmann Jens Limpert Jan Rothhardt Institute of Applied Physics Abbe Center of PhotonicsFriedrich-Schiller-University JenaAlbert-Einstein-Straße 1507745 JenaGermany Helmholtz-Institute Jena Fröbelstieg 307743 JenaGermany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 164291 DarmstadtGermany Present address:Carl Zeiss AG Carl-Zeiss-Promenade 1007745 JenaGermany Leibniz Institute for Natural Product Research and Infection Biology Hans Knöll Institute(Leibniz-HKI)Adolf-Reichwein-Str.2307745 JenaGermany Department of Pharmaceutical Microbiology Hans Knöll Institute(HKI)Friedrich-Schiller-University JenaWinzerlaer Straße 207745 JenaGermany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str.707745 JenaGermany Present address:Biochemistry/Biotechnology Faculty of EngineeringHochschule Wismar University of Applied Sciences TechnologyBusiness and DesignPhilipp-Müller-Str.1423966 WismarGermany

Table-top extreme ultraviolet(EUV)microscopy offers unique opportunities for label-free investigation of biological ***,we demonstrate ptychographic EUV imaging of two dried,unstained model specimens:germlings of a fungus(Aspergillus nidulans),and bacteria(Escherichia coli)cells at 13.5 nm *** find that the EUV spectral region,which to date has not received much attention for biological imaging,offers sufficient penetration depths for the identification of intracellular *** implementing a position-correlated ptychography approach,we demonstrate a millimeter-squared field of view enabled by infrared illumination combined with sub-60 nm spatial resolution achieved with EUV illumination on selected regions of *** strong element contrast at 13.5 nm wavelength enables the identification of the nanoscale material composition inside the *** work will advance and facilitate EUV imaging applications and enable further possibilities in life science.

关键词： EUV Ptychography Microorganism HHG

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GatherTweet: A Python Package for Collecting Social Media Data on Online Events

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Journal of Computer and Communications 2023年第2期11卷 172-193页

作者： Claudia Kann Sarah Hashash Zachary steinert-Threlkeld R. michael Alvarez Department of Humanities and Social Sciences California Institute of Technology Pasadena USA Luskin School of Public Affairs University of California Los Angeles Los Angeles USA

Social media plays a crucial role in the organization of massive social movements. However, the sheer quantity of data generated by the events as well as the data collection restrictions that researchers encounter, leads to a series of challenges for researchers who want to analyze dynamic public discourse and opinion in response to and in the creation of world events. In this paper we present gatherTweet, a Python package that helps researchers efficiently collect social media data for events that are composed of many decentralized actions (across both space and time). The package is useful for studies that require analysis of the organizational or baseline messaging before an action, the action itself, and the effects of the action on subsequent public discourse. By capturing these aspects of world events gatherTweet enables the study of events and actions like protests, natural disasters, and elections.

关键词： Data Science Movements Social Media Data Twitter Network Science Data Mining Python

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