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Terahertz Spectroscopy Lab
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A lab that uses terahertz spectroscopy to explore the properties of glass and other materials.
AboutAbout the lab
Tackling unsolved problems in glass with terahertz light.
The Terahertz Spectroscopy Lab uses terahertz spectroscopy to study the properties of glass and other materials with disordered structures.
One subject is the boson peak, an excitation that appears universally in glasses and is known as one of the unsolved problems in glass physics.
The lab's research is centered on a terahertz time-domain spectrometer and is combined with large-scale molecular dynamics simulations.
Besides glass, the lab also studies other materials with disordered structures, such as proteins.
Key terms
- Terahertz light
- Electromagnetic waves with a wavelength of about 0.3 mm. Their frequency lies between that of mobile phone radio waves and visible light.
- Boson peak
- A universal excitation that appears in disordered structures such as glass. It is one of the unsolved problems in glass physics.
- Fractal dynamics
- The behavior that appears when a fractal structure exists at the nanoscale. It involves excitations called "fractons."
NewsLab news
Paper on the boson peak of obsidian, a collaboration with Professor Emeritus Seiji Kojima, published in Materials
Paper on a continuum model of the terahertz dielectric response of glass published in Phys. Rev. B
Professor Emeritus Seiji Kojima and Assistant Professor Tatsuya Mori write a chapter in the book Ferroic Materials
Paper on covalent network glasses, a collaboration with The University of Tokyo, published in PNAS
Paper on phonon polaritons in KTaO3, a collaborative study, published in Solids
ResearchResearch themes
Using rapidly advancing terahertz spectroscopy techniques and computational science, the lab works to resolve and apply solutions to unsolved problems in glass physics. It carries out its research together with many collaborators in Japan and abroad.
*Illustrative imageStudy of elementary excitations in the terahertz range
The lab investigates how materials respond in the terahertz range, mainly using terahertz time-domain spectroscopy and terahertz Raman scattering. Its targets are the various important elementary excitations that exist in the terahertz range.
Study of universal excitations in glass
Using terahertz spectroscopy and large-scale molecular dynamics simulations, the lab investigates the boson peak of glass and fractal dynamics in nanoscale fractal structures. It takes on points that are still not well understood quantitatively in real glasses.
*Illustrative imageStudy of material properties by infrared and Raman spectroscopy
Centered on high-precision terahertz infrared and Raman spectroscopy, the lab investigates properties of materials that remain unexplained. The main instrument is a terahertz time-domain spectrometer, which measures about 0.1 to 4.5 THz, and the temperature can be varied continuously from 4 K to 800 K.
MembersFaculty
The members of the Terahertz Spectroscopy Lab are faculty, master's students, and undergraduate students.As of 2026
- Assistant ProfessorTatsuya Mori
VoicesStudent voices
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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: “Connecting a laser & optical fibres to an optical communications system testbed” NiamhTalking90 / CC BY-SA 4.0 (cropped)
- Study of elementary excitations in the terahertz range: “Infrared spectrometer for screening for food adulteration, in CAFIA laboratory, Czech Republic” Sarka Na kopci / CC BY-SA 4.0 (cropped)
- Study of material properties by infrared and Raman spectroscopy: “Standoff Laser Spectroscopy System ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (非線形フォトニクス): “Laser LY-RGBW01 internals optical table shining in smoke PC301984” Alexey Vazhnov / CC BY-SA 4.0 (cropped)
- Related lab (プラズマ物理工学): “Compact Toroidal Hybrid at Auburn University” GJHartwell / CC BY-SA 4.0 (cropped)
- Related lab (磁気機能工学): “Nuclear magnetic resonance devices in CAFIA laboratory” Sarka Na kopci / CC BY-SA 4.0 (cropped)
- Related lab (固体光物性工学研究室): “Libs Laser-induced breakdown spectroscopy” US Army Research Laboratory / Public domain (cropped)
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