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Novel Functional Materials Lab
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The lab explores new physical properties, devices, and systems using semiconductor-based optical materials.
AboutAbout the lab
Exploring novel physical properties and creating devices and systems
The Novel Functional Materials Lab studies optical materials, centered on wide-bandgap semiconductors.
The lab aims to explore previously unknown physical properties and to propose and create device structures and systems.
Examples include the lab's own development of a gigabit-class deep-ultraviolet LED optical wireless communication system for 6G and a new spectroscopic analysis technique (ODPL spectroscopy).
On the lab's website, it is introduced under the name "Kojima Lab."
Key terms
- Deep-ultraviolet light
- Light with wavelengths of roughly 200 nm to 300 nm. There is no clear boundary.
- Gbps
- A unit for the amount of data that can be transmitted per second. 1 Gbps is 10^9 bits per second.
- Circularly polarized light
- Light whose electric field keeps a constant strength while its direction rotates as the light propagates.
- Spectroscopy
- A technique that analyzes the light from a measured object by component, such as wavelength or energy.
NewsLab news
A doctoral student's paper was published in Optical Materials Express
A master's student's paper was published in Optics Letters
A doctoral student received the 57th Japan Society of Applied Physics Presentation Encouragement Award
A press release was issued on the lab's research on "semiconductors that cool with light"
ResearchResearch themes
Centered on optical materials, mainly wide-bandgap semiconductors, the lab aims to explore previously unknown physical properties and to propose and create device structures and systems. The research and development process is carried out end to end, from basic research to applications and commercialization.
*Illustrative imageEvaluating the Optical Properties of Deep-Ultraviolet LEDs
Deep-ultraviolet light with wavelengths shorter than 300 nm can inactivate microorganisms that act as pathogens. The lab evaluates the optical properties of aluminum gallium nitride (AlGaN) light-emitting diodes that emit this light.
*Illustrative imageOptical Wireless Communication Resistant to Sunlight
Deep-ultraviolet light is almost absent from solar radiation at the Earth's surface, so low-noise optical wireless communication is expected even outdoors during the day. The lab works on realizing Gbps-class high-speed optical wireless communication systems using deep-ultraviolet LEDs, and on clarifying the mechanism of high-speed LED modulation.
*Illustrative imageSemiconductor Devices That Emit and Receive Circularly Polarized Light
The lab aims to realize a device that can efficiently generate and detect circularly polarized light with a single tiny semiconductor element and that can also be integrated. It pursues this through both device design based on optical phase control and actual device fabrication.
*Illustrative imageODPL Spectroscopy: An Evaluation Technique for Semiconductor Crystals
Quality control of large gallium nitride (GaN) wafers requires a method that can inspect the entire wafer surface quickly and with high sensitivity. The lab is developing omnidirectional photoluminescence (ODPL) spectroscopy as an evaluation technique that meets this need.
MembersFaculty
The members of the Kojima Lab consist of faculty, technical assistants, research support staff, administrative assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKazunobu Kojima
- Associate Professor (Concurrent)Shuhei Ichikawa
- LecturerMasaya Ueda
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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: “Optoelectronic Devices” A.dobratiqi / CC BY-SA 3.0 (cropped)
- Evaluating the Optical Properties of Deep-Ultraviolet LEDs: “MTA Moves Forward with Ultraviolet Pilot for Disinfecting Full Trains ( )” Metropolitan Transportation Authority of the State of New York from United States of America / CC BY 2.0 (cropped)
- Optical Wireless Communication Resistant to Sunlight: “FSO-gigabit-laser-link-0a” Adamantios / CC BY-SA 3.0 (cropped)
- Semiconductor Devices That Emit and Receive Circularly Polarized Light: “Lyot-filter” TMM53 / CC BY 4.0 (cropped)
- ODPL Spectroscopy: An Evaluation Technique for Semiconductor Crystals: “CdSeNanoplatelets” Kabotin / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Photonics Lab): “Scientist measures the optical limiting performance of a nonlinear material - ALC” Adelphi Lab Center Douglas G. LaFon / CC BY 2.0 (cropped)
- Related lab (Materials Innovation Lab): “Supercontinuum in a microstructured optical fiber” Blinking Spirit, and Dimitris Papadopoulos / CC BY-SA 3.0 (cropped)
- Related lab (Wireless Systems Engineering Lab): “Wireless communication tower” Yvesmayrand / CC BY-SA 3.0 (cropped)
- Related lab (Information Device Lab): “Nortel Networks AA1419001 GBIC transceiver laser diode tear down” Mister rf / CC BY-SA 4.0 (cropped)
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