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Optoelectronics Lab
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A lab that uses terahertz waves, which lie between radio waves and light, to see through the inside of packages.
AboutAbout the lab
At the forefront of terahertz waves, light that builds the future.
The lab studies sources and detectors of terahertz waves, a type of electromagnetic wave, and their applications.
Terahertz waves have characteristics of both radio waves and light, and pass through materials such as paper, plastic, and wood.
Using wavelength conversion technology for laser light, the lab has succeeded in developing a widely tunable terahertz source that is far more compact and easier to use than sources such as free-electron lasers.
The lab is also developing new terahertz imaging technologies for applications such as inspecting mail and pharmaceuticals.
Key terms
- Terahertz waves
- Electromagnetic waves with frequencies of roughly 0.3 to 10 THz. They lie between radio waves and light and have characteristics of both.
- Wavelength conversion
- Changing light of one wavelength (color) into light of another wavelength using a crystal or similar material.
- Nonlinear optical crystal
- A crystal that, when intense light enters it, produces light of a different wavelength from the input light.
NewsLab news
A master's student received the Best Poster Presentation Award (1st place) at MTSA 2026
A student received the Excellence Presentation Award at the FY2025 Laser Society of Japan Chubu Chapter Young Researchers' Presentation Meeting
A student received the Best Student Paper Award at IRMMW-THz 2025
A student received the Paper Presentation Encouragement Award at the 45th Annual Meeting of the Laser Society of Japan
A student received the Excellence Presentation Award at the FY2024 Laser Society of Japan Chubu Chapter Young Researchers' Presentation Meeting
ResearchResearch themes
Terahertz waves combine the characteristics of radio waves and light and are expected to have many applications, but the development of sources and detectors has lagged, which has held back their use. The lab develops high-power sources and highly sensitive detectors, aiming to open up new applications of terahertz waves and put them into practical use.
*Illustrative imageOriginal terahertz source: is-TPG
This is a source (an injection-seeded terahertz parametric generator) that sends near-infrared light of two wavelengths into a nonlinear optical crystal to generate terahertz waves at world-leading power levels. By running the generation process in reverse and converting terahertz waves into near-infrared light, the lab has also achieved ultra-high-sensitivity detection.
*Illustrative imageMeasuring and identifying in real time
By generating multiple wavelengths simultaneously or switching wavelengths at high speed, the lab captures information at multiple wavelengths in a single camera frame. Machine learning is used to recognize the images and identify samples in real time.
*Illustrative imageFinding illicit drugs inside mail
The lab has succeeded in measuring sugars that imitate illicit drugs and are hidden behind thick shielding made of envelopes, cardboard, and bubble wrap, then comparing their absorption spectra with a database to image their distribution. The lab is further improving performance toward enforcement at customs and international mail offices.
*Illustrative imageDetecting extremely weak terahertz waves
By using a multi-stage detector and removing noise between the stages, the lab has made it possible to detect extremely weak terahertz waves. It can now image objects beneath shielding that strongly attenuates light.
MembersFaculty
The lab's members consist of faculty, doctoral, master's, and undergraduate students, and secretaries.As of 2026
- ProfessorKodo Kawase
- Associate ProfessorKosuke Murate
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: “Laser experiment - Photonics Laboratory - Physics Department - Ateneo de Manila University” Physics Department Ateneo de Manila University / CC BY 2.0 (cropped)
- Original terahertz source: is-TPG: “Infrared (1064 nm) Laser Beams and Pre-Mode Cleaner” Tobin from Rochester, NY, USA / CC BY-SA 2.0 (cropped)
- Measuring and identifying in real time: “HyperspectralCube” Dr. Nicholas M. Short, Sr. / Public domain (cropped)
- Finding illicit drugs inside mail: “Briefumschlag (fcm)” Photograph: Frank C. Müller, Baden-Baden / CC BY-SA 2.5 (cropped)
- Detecting extremely weak terahertz waves: “Pioneer DVD Optical Sensor ( )” Cole L / CC BY-SA 2.0 (cropped)
- Related lab (Quantum Optoelectronics Lab): “Ti Sapphire laser TIS-SF-07” Sergey100 / Public domain (cropped)
- Related lab (Power Electronics Lab): “Circuit Board 2015” Jguarin / CC BY-SA 4.0 (cropped)
- Related lab (Image Informatics Lab): “Holography setup 3” Epzcaw / CC BY-SA 4.0 (cropped)
- Related lab (Nanobiosensing Lab): “Atomic force microscope by Zureks” Zureks / CC BY-SA 3.0 (cropped)
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