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Energy Quantum Materials Science Lab
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An electron microscopy lab that captures changes in energy materials with pulsed electron beams.
AboutAbout the lab
Advancing ultrafast electron beam measurement and accelerating energy materials development
The Energy Quantum Materials Science Lab (Kuwahara Lab) aims to reveal the dynamic nature of local states in energy materials such as plasmonic materials, optical semiconductors, and artificial photosynthesis materials.
Using a time-resolved electron microscope built around the lab's own pulsed electron source, the lab is advancing local structure analysis at the nanometer scale.
The lab aims to capture energy relaxation processes, structural phase transitions, and changes in chemical bonding states that occur in materials and devices under actual operating conditions, over a wide range of time scales from sub-picoseconds to several seconds.
The lab's website introduces it under the name "Kuwahara Lab."
Key terms
- Pulsed electron beam
- An electron beam emitted for only a very short time. It is used to follow changes in a sample by dividing time into short slices.
- Time-resolved electron microscope
- An electron microscope that uses a pulsed electron beam to observe changes in a sample over time.
- Operando
- Investigating changes in a material or device while it is actually operating.
NewsLab news
A master's student won the Excellent Poster Award at the 82nd Annual Meeting of the Japanese Society of Microscopy
A doctoral student won the Student Poster Award at the FY2025 Nagoya University Synchrotron Radiation Research Center Symposium
A master's student won the best poster award Instrumentation and Method at MC2025
ResearchResearch themes
To contribute to the advancement of energy-saving devices, the lab aims to elucidate the functions of energy materials and improve their performance. To this end, it pursues measurements using time-resolved electron microscopy in five directions, including advancing ultrafast measurement, operando electron beam measurement, low-dose electron beam measurement, and integration with photon beam measurement.
*Illustrative imageAdvancing Ultrafast Time-Resolved Measurement
The lab aims to realize a 200-kV aberration-corrected pulsed TEM that can examine the nanostructure of both reversible and irreversible processes on time scales beyond the microsecond scale. The goal is to achieve 100 ns time resolution in single-shot TEM images.
*Illustrative imageOperando Electron Beam Measurement Tracking Actual Operation
Using a 100-kV time-resolved TEM, the lab synchronizes time-modulated pulsed electrons with triggers such as the electrical signals that drive a device or the light that excites a sample. The lab will realize high-speed operando imaging of reversible processes and also take on the measurement of irreversible processes.
*Illustrative imageAchieving Measurement at Low Electron Dose
The lab extracts motion components using spatiotemporal correlations to draw meaningful information from TEM images taken at a low electron dose. It aims to improve time resolution by an order of magnitude by shortening exposure time, and also tries to improve computational speed and accuracy using Bayesian estimation.
*Illustrative imageIntegration with Photon Beam Measurement
In addition to electron microscopy, the lab measures the same samples with lasers and X-rays, aiming to extract indicators for performance improvement from multifaceted measurement information. It also works on combined measurements using synchrotron radiation and an ultrahigh-voltage electron microscope.
MembersFaculty
The members of the Kuwahara Lab consist of faculty, researchers, doctoral, master's, and undergraduate students, administrative staff, technical staff, and technical assistants.As of 2026
- ProfessorMasato Kuwahara
- Associate ProfessorSatoshi Ogawa
- Project Assistant ProfessorChisaki Iwashimizu
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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” Juraj Kubica from Bratislava, Slovakia / CC BY-SA 2.0 (cropped)
- Advancing Ultrafast Time-Resolved Measurement: “Transmission electron microscope (3)” Gannu03 / CC BY-SA 4.0 (cropped)
- Operando Electron Beam Measurement Tracking Actual Operation: “Kramer Electronics SID-X1 - board-9651” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Achieving Measurement at Low Electron Dose: “Scanning electron microscope - UFCH JH (2020) 01” Tadeáš Bednarz / CC BY-SA 4.0 (cropped)
- Integration with Photon Beam Measurement: “ID20 ESRF RIXS spectrometer” Gps1810 / CC BY-SA 4.0 (cropped)
- Related lab (Energy Functional Materials Engineering Lab): “Thin film growth defect” Evavilova / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Beam Imaging Engineering Lab): “Radiacode 102” Mykhal / CC0 (cropped)
- Related lab (Energy Thermofluids Engineering Lab): “False color image of the far field of a submerged turbulent jet” C. Fukushima and J. Westerweel, Technical University of Delft, The Netherlands / CC BY 3.0 (cropped)
- Related lab (Energy and Resource Circulation Science Lab): “Chemistry Laboratory - Bench” Jean-Pierre from Cosne-Cours-sur-Loire (Nièvre, Burgundy region), France / CC BY-SA 2.0 (cropped)
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