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3. Nanoparticle Chains for Plasmonic Band Engineering

Author

Axel Lubk, Anja Maria Steiner, Pavel Potapov, Martin Mayer, Andreas Fery, Jonas Krehl, Tobias A. F. König, Daniel Schletz, and Johannes Schultz

Subjects
Materials science, Band engineering, Nanoparticle, Nanotechnology, Instrumentation, Plasmon
Published
2021
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9. Nanoparticle Chains for Plasmonic Band Engineering

Author

Schultz, Johannes, primary, Schletz, Daniel, additional, Potapov, Pavel, additional, Steiner, Anja Maria, additional, Krehl, Jonas, additional, König, Tobias, additional, Mayer, Martin, additional, Lubk, Axel, additional, and Fery, Andreas, additional

Published
2021
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12. Direct Correction of Residual Symmetric Aberrations in Electron Holograms of Weak Phase Objects

Author

Felix Kern, Himani Arora, Tore Niermann, Sibylle Gemming, Martin Linck, Daniel Wolf, Axel Lubk, Nasim Alem, and Artur Erbe

Subjects
010302 applied physics, electron holography, Materials science, business.industry, Holography, Phase (waves), ERC, 02 engineering and technology, Electron, all-electron, 2D materials, 021001 nanoscience & nanotechnology, Residual, 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, 0210 nano-technology, business, density-functional calculations, Instrumentation
Abstract

Thin TEM specimen are regarded as weak objects (WPO), if the amplitude variation of the electron wave by the specimen can be neglected and the phase modulation is very small (≪π). Large classes of topical materials can be described in this approximation, such as most 2D materials, organic semiconductor materials or biological specimen. Due to the lack of amplitude (and hence intensity) contrast, conventional TEM (CTEM) investigations on WPOs are commonly performed under a certain defocus, which transfers part of the phase information to the recorded intensity. This intermixing contrast transfer from amplitude to phase and vice versa is commonly described by the phase contrast transfer function (PCTF), while the non-mixing contrast transfer for amplitude and phase is referred to as amplitude contrast transfer function (ACTF). Due to the transfer gap in the PCTF, the CTEM contrast transfer at low spatial frequencies is degraded in defocused images of WPOs (Fig. 1). By employing electron holography, however, both amplitude and phase of the electron wave can be reconstructed without a transfer gap. Having the whole wave information also enables the a-posteriori correction of geometric aberrations as it was already proposed in D. Gabor’s seminal paper from 1948 [1]. The realization of his idea, however, remains challenging in the absence of additional knowledge about the sample, due to the lack of a criterion for a successful aberration correction.

Published
2019
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15. Towards Induction Mapping of the 3D Spin Texture of Skyrmions

Author

Sebastian Schneider, Bernd Büchner, Michael W. I. Schmidt, Kornelius Nielsch, Song Jin, Daniel Wolf, Bernd Rellinghaus, Axel Lubk, Darius Pohl, Sebastian T. B. Goennenwein, and Matthew J. Stolt

Subjects
Physics, Condensed matter physics, Skyrmion, 0103 physical sciences, 02 engineering and technology, Texture (crystalline), 021001 nanoscience & nanotechnology, 010306 general physics, 0210 nano-technology, 01 natural sciences, Instrumentation, Spin-½
Published
2018
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16. A Novel Method for Automatic Determination of the Number of Meaningful Components in the PCA Analysis of Spectrum-Images

Author

Paolo Longo, Axel Lubk, and Pavel Potapov

Subjects
business.industry, 0202 electrical engineering, electronic engineering, information engineering, 020206 networking & telecommunications, Pattern recognition, 02 engineering and technology, Artificial intelligence, 021001 nanoscience & nanotechnology, 0210 nano-technology, business, Instrumentation, Spectrum (topology), Mathematics
Published
2018
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17. Magnetic Configurations in Three-Dimensional Nanomagnets Explored by Electron Holographic Tomography

Author

Jonas Krehl, Etienne Snoeck, Christophe Gatel, Axel Lubk, Sebastian Sturm, and Daniel Wolf

Subjects
0301 basic medicine, Materials science, business.industry, Holography, 02 engineering and technology, Electron, 021001 nanoscience & nanotechnology, Nanomagnet, law.invention, 03 medical and health sciences, 030104 developmental biology, Optics, law, Tomography, 0210 nano-technology, business, Instrumentation
Published
2018
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22. Towards Induction Mapping of the 3D Spin Texture of Skyrmions

Author

Schneider, S., primary, Wolf, D., additional, Stolt, M. J., additional, Jin, S., additional, Pohl, D., additional, Rellinghaus, B., additional, Schmidt, M., additional, Büchner, B., additional, Goennenwein, S. T. B., additional, Nielsch, K., additional, and Lubk, A., additional

Published
2018
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25. Spin-Multislice Applied to the Electron Spin Interaction with Materials

Author

Jan Rusz, Ebrahim Karimi, Alexander Edström, Spencer J. H. Alexander, Vincenzo Grillo, Ben McMorran, and Axel Lubk

Subjects
Physics, Spin polarization, Condensed matter physics, Spinplasmonics, Strongly correlated material, Multislice, Spin engineering, Spin–orbit interaction, Zero field splitting, Spin (physics), Instrumentation
Published
2015
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27. Electron holography: state and prospects

Author

Sebastian Sturm Karin Vogel, Hannes Lichte, Felix Börrnert, Bernd Einenkel, A. Lenk, Axel Lubk, Jan Sickmann, Falk Röder, and Daniel Wolf

Subjects
Diffraction, Physics, business.industry, Replica, Holography, Phase (waves), Physics::Optics, Interference (wave propagation), Electron holography, law.invention, Optics, Amplitude, law, business, Instrumentation, Diffraction grating
Abstract

The phase loss encountered in conventional (S)TEM means a substantial loss of object information, because essential structure components, e.g. electric and magnetic fields, mainly modulate the image phase hence are virtually invisible in a conventional micrograph. This presents a huge obstacle for a thorough understanding of modern functional materials e.g. in semiconductors and nano-magnetism. Phases can only be determined by interference of the image wave with a reference wave. Gabor’s bright idea of holography was to use the interference pattern (hologram) as a diffraction grating, where one of the diffracted waves turns out a replica of the image wave. This replica wave is reconstructed from the hologram allowing subsequent quantitative evaluation of both amplitude and phase separately.

Published
2014
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30. Electron Holography at Low Voltages Exemplified by Graphene

Author

Hannes Lichte, Axel Lubk, Felix Börrnert, Daniel Wolf, and Falk Röder

Subjects
Materials science, Optics, business.industry, Graphene, law, Optoelectronics, business, Instrumentation, Electron holography, Voltage, law.invention
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013
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31. Progress in electrons vortex creation and application in a transmission electron microscope

Author

Laura Clark, Armand Béché, G. Van Tendeloo, He Tian, Roeland Juchtmans, R. Van Boxem, Axel Lubk, Giulio Guzzinati, and Jo Verbeeck

Subjects
Physics, Condensed matter physics, Transmission electron microscopy, Electron, Atomic physics, Instrumentation, Vortex
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013
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32. Transport of Intensity Phase Reconstruction Revisited

Author

Giulio Guzzinati, Axel Lubk, Laura Clark, and Jo Verbeeck

Subjects
Optics, Materials science, business.industry, business, Instrumentation, Phase reconstruction, Intensity (physics)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013
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35. Electron holography: state and prospects

Author

Lichte, Hannes, primary, Börrnert, Felix, additional, Einenkel, Bernd, additional, Lenk, Andreas, additional, Lubk, Axel, additional, Röder, Falk, additional, Sickmann, Jan, additional, Karin Vogel, Sebastian Sturm, additional, and Wolf, Daniel, additional

Published
2014
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36. Mapping Intrinsic Electric Fields Through Off-Axis Electron Holography: Prospects and Problems

Author

Axel Lubk, Falk Röder, Kenji Tsuda, Karin Vogel, Martin Linck, A. Lenk, Hannes Lichte, and Daniel Wolf

Subjects
Physics, Optics, business.industry, Electric field, business, Instrumentation, Electron holography
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Published
2010
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