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Electron Beam Nanophysics and Engineering Lab
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A lab that uses new electron beams to observe the structure and dynamics of the nanoworld.
AboutAbout the lab
Seeing the nanoworld with electron beams
The Saitoh Lab studies materials using electron beams.
Because electrons have a much shorter wavelength than light, an electron microscope can image objects on the nanometer scale that are difficult to see with an optical microscope.
Beyond magnified imaging, it can also perform elemental analysis and analyze electronic states and crystal structures.
Currently, the lab is working on research that uses electron vortex beams for observation, a transmission electron microscope that uses spin-polarized electron beams, and the development of an electron microscope that captures extremely fast changes.
Key terms
- Electron beam
- Electrons focused into a narrow stream and directed in a uniform direction. In an electron microscope, it is aimed at a material to form an image
- Quasicrystal
- A material whose atoms are arranged according to a special rule: it has no repeating periodicity like a crystal, yet is not random
- Spin polarization
- A state in which the directions of the tiny magnets carried by electrons (their spins) are aligned in one direction
- Skyrmion
- A nanometer-scale magnetic structure in which the directions of tiny magnets in a material are arranged in a vortex-like pattern
NewsLab news
A master's student received the M&M Student Scholar Award
Prof. Saitoh and colleagues received the Paper Award and the Japanese Journal Award from the Japanese Society of Microscopy
A master's student received the Presentation Encouragement Award from the Japan Society of Applied Physics
A master's student received the An-Pang Tsai Award (Student Category)
In joint research with Hitachi High-Tech and others, the atomic arrangement of a surface at the single-atomic-layer level was observed using secondary electrons
ResearchResearch themes
The lab works with electron beams. Its research includes analyzing various materials such as semiconductors, magnetic materials, and quasicrystals, generating new electron beams for electron microscopy, and developing new electron microscopes.
*Illustrative imageAnalyzing Electron Microscope Images with Data Science
To reduce damage to samples from the electron beam and to speed up imaging, there is a method of irradiating only a thinned-out subset of locations. The lab develops methods that restore the missing image data using techniques such as dictionary learning and tensor decomposition, improving resolution and removing noise.
*Illustrative imageDeveloping Methods for Characterizing Materials
The lab works on methods that use convergent-beam electron diffraction to examine strain and defects in crystals in nanometer-scale regions, structural analysis of quasicrystals, and analysis that determines the orientation of electron orbitals from how electrons are scattered.
*Illustrative imageDevelopment and Applications of Electron Vortex Beams
An electron vortex beam is an electron wave with a helical wavefront. It is expected to be applied to areas such as magnetic imaging, and the lab clarifies its properties in order to use it in new observation methods for electron microscopy.
*Illustrative imageSpin-Polarized Pulsed Transmission Electron Microscope
The lab has succeeded in developing a transmission electron microscope that controls electron spin and time. It captures extremely fast changes and is used to study the nanoscale dynamics of targets such as plasmons, skyrmions, polymers, and rocks.
MembersFaculty
The Saitoh Lab consists of faculty members and master's and undergraduate students.As of 2026
- ProfessorKoh Saitoh
- Associate ProfessorKiyo Shibata
- Assistant ProfessorTakafumi Ishida
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Transmission Electron Microscope Kemira” kallerna / Public domain (cropped)
- Analyzing Electron Microscope Images with Data Science: “Transmission electron microscope (3)” Gannu03 / CC BY-SA 4.0 (cropped)
- Developing Methods for Characterizing Materials: “Ho-Mg-Zn E8-5Cube” Materialscientist (original image) Jgmoxness (derivative work) / CC BY-SA 3.0 (cropped)
- Development and Applications of Electron Vortex Beams: “31LK3b electron gun” Mister rf / CC BY-SA 4.0 (cropped)
- Spin-Polarized Pulsed Transmission Electron Microscope: “Scanning electron microscope - UFCH JH (2020) 01” Tadeáš Bednarz / CC BY-SA 4.0 (cropped)
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- Related lab (材料設計工学研究グループ): “Multicrystalline silicon wafer with thin film iridescence” Radiotrefoil / CC BY-SA 4.0 (cropped)
- Related lab (レオロジー物理工学研究グループ): “Hand in a non-newtonian fluid 05” ElisaG87 / CC BY 4.0 (cropped)
- Related lab (物性基礎工学研究グループ): “Superconductor ring and magnet in levitation” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), LPS, Orsay, France / CC BY-SA 3.0 (cropped)
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