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Sannomiya Lab
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A lab that confines light in nanostructures and observes it with electron microscopy.
AboutAbout the lab
Create new materials, observe with new methods, and make new discoveries.
The Sannomiya Lab researches new functional materials that confine light.
The lab makes plasmonic materials, in which the collective oscillation of free electrons in metals is controlled, as well as sensors and filtering devices.
Combining self-assembly and lithography, the lab controls the composition, microstructure, and interfaces of materials to produce new functions.
To verify those functions visually, the lab also puts effort into developing measurement methods based on transmission electron microscopy.
Key terms
- Plasmonic materials
- Materials that use the phenomenon in which free electrons in a metal oscillate collectively to concentrate light energy in a tiny space
- Cathodoluminescence
- A phenomenon in which a material emits light when hit by an electron beam. Measuring the emitted light reveals the state of the optical field
- Self-assembly
- The process by which materials form regular structures on their own through natural processes. Structures form without fine fabrication
NewsLab news
Graduate school information session held (in-person session includes a lab tour)
Student wins Excellent Poster Award at the Japanese Society of Microscopy meeting
Student wins Excellent Poster Award at the international conference SPP11
Student wins Excellent Poster Award and Student Excellent Presentation Award at the Japanese Society of Microscopy meeting
Student wins Poster Award at the Japan Society of Applied Physics meeting
ResearchResearch themes
The lab aims to create new functional materials that dramatically advance technologies in the environment, energy, biotechnology, and communications. It also works on creating innovative measurement techniques to characterize those functions.
*Illustrative imageMaterials that confine light
Using dielectric nanostructures or plasmonic materials, in which the collective oscillation of free electrons in metals is spatially controlled, light energy can be concentrated in a tiny space. This is expected to enable highly efficient light-energy conversion materials and ultrasensitive, portable sensors.
*Illustrative imageSeeing optical fields with electrons
Using cathodoluminescence, which captures the light from plasmons excited by an electron beam, the lab visualizes optical electric fields smaller than the wavelength at the 1 nm scale. Surface waves of free electrons can be observed like waves traveling across a water surface.
*Illustrative imageDeveloping transmission electron microscopy
Based on transmission electron microscopy, which can reveal the structure of matter at the atomic scale, the lab also develops new techniques and application methods. This work is done jointly with universities and research institutes, as well as with companies.
MembersFaculty
The members of the Sannomiya Lab consist of faculty, researchers, postdoctoral researchers, technical support staff, support staff, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakumi SannomiyaPublications ↗
- Assistant ProfessorSotatsu Yanagimoto
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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: “Gold Colloid of varying size” Kumarbarc / CC BY-SA 4.0 (cropped)
- Materials that confine light: “Opal-black1” Ra'ike (see also: de:Benutzer:Ra'ike) / CC BY 3.0 (cropped)
- Seeing optical fields with electrons: “Cathodoluminescence images (Stitched) of dolomite from the Irish zinc-lead ore field” Aileen Doran / CC BY 4.0 (cropped)
- Developing transmission electron microscopy: “Transmission Electron Microscope Kemira” kallerna / Public domain (cropped)
- Related lab (北本研究室): “Ferrofluid Magnet under glass edit” Gregory F. Maxwell / CC BY-SA 3.0 (cropped)
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