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Katayama-Tahara Lab
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The lab develops new spectroscopy methods using ultrashort pulse lasers and explores the physical properties of materials.
AboutAbout the lab
Exploring the nature of novel materials with ultrashort pulse lasers.
The Katayama-Tahara Lab develops new spectroscopy methods using ultrashort pulse lasers and uses them to study the physical properties of novel materials.
The Katayama lab develops methods to detect terahertz-range information with a single laser pulse, as well as techniques to visualize ultrafast phenomena that occur at the nanoscale.
The group's base at Yokohama National University (YNU), the Terahertz and Nano-Optical Science Research Center, aims to advance technology development in terahertz science and nanoscience and to promote collaboration with researchers inside and outside the university.
The center focuses on visualizing invisible phenomena with its own methods, such as single-shot spectroscopy and nano-optical techniques.
Key terms
- Ultrashort pulse laser
- A pulsed laser that emits light for an extremely short time. It serves as a tool for studying fast phenomena.
- Scanning tunneling microscope
- A microscope that traces a surface with the tip of a sharp needle to examine the surface at the nanoscale.
- High-order harmonics
- Light with a higher frequency than the original light, generated when low-frequency infrared light is applied to a material.
NewsLab news
Paper published from a joint study with the University of Tokyo that evaluated pulsed semiconductor lasers using machine learning
Associate Professor Hirokazu Tahara received the Yokohama National University Best Teacher Award
Paper published on terahertz emission from the early stages of laser ablation
Paper published on nanoscale phase change observed with terahertz STM
A master's student and an undergraduate student received the Excellence Award of the Physical Engineering Education Program
ResearchResearch themes
The Katayama-Tahara Lab develops new spectroscopy methods using ultrashort pulse lasers and investigates the physical properties of novel materials. On the Katayama lab's page, the main research themes are presented as terahertz-range detection technology, visualization of ultrafast nanoscale phenomena, high-order harmonics, and broadband spectroscopy.
*Illustrative imageMeasuring Terahertz Signals with a Single Laser Pulse
The lab develops techniques that can detect information in the terahertz range on picosecond timescales with a single laser pulse. These are presented as single-shot spectroscopy and a terahertz oscilloscope.
*Illustrative imageTerahertz Scanning Tunneling Microscopy
The lab develops technology that combines scanning tunneling microscopy with terahertz pulse technology to visualize ultrafast phenomena occurring at the nanoscale.
*Illustrative imageHigh-Order Harmonic Generation in Metallic Materials
The lab studies high-order harmonics, which are generated when low-frequency infrared light is irradiated onto a material, with a focus on metallic materials.
*Illustrative imageBroadband Terahertz and Coherent Phonon Spectroscopy
Using laser pulses with extremely short pulse widths, the lab conducts research on broadband terahertz spectroscopy and coherent phonon spectroscopy.
MembersFaculty
Members of the Katayama-Tahara Lab consist of faculty, emeritus professors, visiting professors, visiting researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorIkufumi Katayama
- Associate ProfessorHirokazu Tahara
- Assistant ProfessorMarvin Alexander Weiss
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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: “Spectroscopy; Terahertz spectroscopy; Biomolecule dynamics ( )” National Institute of Standards and Technology / Public domain (cropped)
- Measuring Terahertz Signals with a Single Laser Pulse: “Terahertz Acceleration Laboratory, Daresbury Laboratory” Mystery Ray / CC0 (cropped)
- Terahertz Scanning Tunneling Microscopy: “ESR-STM at QNS in Ewha - front view” Rickinasia / CC BY-SA 4.0 (cropped)
- High-Order Harmonic Generation in Metallic Materials: “Femtosecond laser spark” Smirnov Semen / CC BY 4.0 (cropped)
- Broadband Terahertz and Coherent Phonon Spectroscopy: “TCSPC schematic” Sobarwiki / Public domain (cropped)
- Related lab (Hong-Akamatsu-Asakawa Lab): “Optical atomic clock ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Horikiri-Ozawa Lab): “Full wafer of Intel quantum computers” Steve Jurvetson from Menlo Park, USA / CC BY 2.0 (cropped)
- Related lab (Bamba Lab): “Cavity Optomechanics” Schmoele / CC BY-SA 3.0 (cropped)
- Related lab (Kosaka-Sekiguchi Lab): “Alice in BBN laboratory - DARPA Quantum Network, January 2003” Daderot / CC0 (cropped)
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