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Optical Properties of Matter Lab
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The lab probes the inside of materials with cutting-edge light such as terahertz light.

AboutAbout the lab
Shining light to see what moves inside matter
The Optical Properties of Matter Lab uses cutting-edge optical technology to search for new phenomena that emerge from the interaction between light and matter, and to investigate the fundamental mechanisms of excited states in materials.
Its research centers on high-intensity terahertz light and the electrons and holes in photoexcited semiconductors, and covers a wide range of topics.
At Kyoto University's Institute for Integrated Cell-Material Sciences (iCeMS), the lab also conducts collaborative research on bio-related materials and new compounds.
Key terms
- Terahertz light
- Electromagnetic waves with frequencies between those of visible light and radio waves (oscillating about one trillion times per second).
- Electron-hole system
- The collection of electrons and the vacancies they leave behind (holes) that form when light shines on a semiconductor.
- Excited state
- A state of a material that has absorbed energy such as light and is at a higher energy than usual.
NewsLab news
A paper by Assistant Professor Inui and colleagues was published in PRX Quantum
A paper by Associate Professor Minowa and colleagues was published in Physical Review A
A paper by Associate Professor Minowa and colleagues was published in Nature Physics
Research results on quantum vortices were published in Nature Physics (joint research with Osaka Metropolitan University and others)
A paper by Professor Naka and colleagues was published in Physical Review Letters
ResearchResearch themes
The lab uses cutting-edge optical technology to search for new phenomena that arise from the interaction between light and matter and to elucidate the elementary processes of excited states in materials. Its research centers on high-intensity terahertz light and the electron-hole systems of photoexcited semiconductors.
*Illustrative imageCoherent Terahertz Light
Terahertz light, which lies between visible light and radio waves, couples to phonons, molecular vibrations, and other excitations, and provides information about materials that could not be measured before. Using this electromagnetic radiation, the lab investigates interesting properties of solids and liquids.
*Illustrative imageNonlinear Phenomena Driven by High-Intensity Terahertz Pulses
Using terahertz pulses of the highest intensity in the world, the lab investigates ultrafast carrier dynamics in semiconductors on femtosecond to picosecond timescales. Carriers accelerated by a strong electric field show nonlinear behavior that does not obey Ohm's law.
*Illustrative imageElectron-Hole Systems in Photoexcited Semiconductors
Using precise optical methods, the lab studies many-body quantum phenomena that appear in photoexcited states of semiconductors, along with their spatiotemporal dynamics. The theme also connects to applications such as solar cells and semiconductor lasers.
*Illustrative imageDynamics of Two-Dimensional Electron Systems
Targeting various two-dimensional systems, such as graphene, chalcogenide layered materials, and the surfaces of topological insulators, the lab aims to understand nonequilibrium dynamics using light and to control new physical properties.
MembersFaculty
- ProfessorNobuko Naka
- Associate ProfessorYosuke Minowa
- Assistant ProfessorKento Uchida
- Assistant ProfessorSosuke Inui
- Assistant ProfessorKohei Eguchi
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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: “Femtosecond Pulse Laser at Cornell University” paul_houle / CC BY-SA 2.0 (cropped)
- Coherent Terahertz Light: “Explosive identification with terahertz waves” Terahertz-applications / CC BY-SA 4.0 (cropped)
- Nonlinear Phenomena Driven by High-Intensity Terahertz Pulses: “Real-time-imaging in terahertz frequency range” Terahertz-applications / CC BY-SA 4.0 (cropped)
- Electron-Hole Systems in Photoexcited Semiconductors: “Bound exciton ( )” UCL Mathematical & Physical Sciences from London, UK / CC BY 2.0 (cropped)
- Dynamics of Two-Dimensional Electron Systems: “GrapheneLattice” Ququ / CC BY-SA 3.0 (cropped)
- Related lab (Light-Driven Solid State Physics Lab (Hirori Lab)): “Superconducting Metamaterial Waveguide Chip” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Kyoto University Quantum Optics Lab): “Experimental Atomic Clock; ytterbium atoms ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Molecular Spectroscopy Lab): “Electrochemical test cell” Hansjoachimkohnke / CC BY-SA 3.0 (cropped)
- Related lab (Physical Chemistry Lab): “Carrier relaxation probed with 2D electronic spectroscopy” Johannes M. Richter, Federico Branchi, Franco Valduga de Almeida Camargo, Baodan Zhao, Richard H. Friend, Giulio Cerullo & Felix Deschler / CC BY 4.0 (cropped)
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