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Masumoto-Ikezawa Lab
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A photophysics lab that probes semiconductor nanostructures with lasers.
AboutAbout the lab
Probing semiconductor nanostructures with lasers
The Masumoto-Ikezawa Lab studies the optical properties of semiconductors a few nanometers in size (semiconductor quantum structures) using laser spectroscopy.
At this size, the wave-like and particle-like nature of electrons, that is, their quantum nature, becomes pronounced, and the electronic properties of solids differ greatly from those at macroscopic sizes.
Using femtosecond and picosecond lasers, the lab follows how phenomena change over time and how they differ in energy, aiming to discover new phenomena and properties.
The lab operates as the experimental condensed matter physics Nanophotonics Group at the University of Tsukuba.
Key terms
- Semiconductor quantum structure
- A semiconductor structure a few nanometers in size in which the quantum nature of electrons appears. Examples include quantum wells and quantum dots.
- Femtosecond
- A unit of time equal to 10^-15 seconds. Laser pulses this short are used to follow how phenomena change over time.
- Single photon
- Light generated one photon (particle of light) at a time. It is required for quantum cryptography and is said to be applicable to the field of quantum information.
ResearchResearch themes
In semiconductors a few nanometers in size, the quantum nature of electrons emerges, and they show electronic properties different from those at macroscopic sizes. The lab investigates such semiconductor quantum structures through their response to light, aiming to discover new phenomena and properties.
*Illustrative imageCreating single photons from impurity emission centers
The lab isolated a single emission center formed by nitrogen impurities in a gallium phosphide (GaP) crystal and demonstrated the generation of single photons of uniform energy. In emission centers made by adding nitrogen to gallium arsenide (GaAs), two-photon interference has also been achieved.
*Illustrative imageTurning defects in boron nitride into single-photon sources
The lab studies individual defects in boron nitride (BN), searching for and evaluating defects that can serve as single-photon sources even at room temperature.
MembersFaculty
The members of the Masumoto-Ikezawa Lab consist of an emeritus professor, faculty members, and doctoral and undergraduate students.
- Associate ProfessorMichio Ikezawa
- Assistant ProfessorShinichi Tomimoto
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 Diode Module” Robert Howie from Perth, Australia / CC BY-SA 2.0 (cropped)
- Creating single photons from impurity emission centers: “Photoluminescence Pathways” Twagnerchem / CC BY-SA 4.0 (cropped)
- Turning defects in boron nitride into single-photon sources: “Boron-nitride-(hexagonal)-top-3D-balls” Benjah-bmm27 / Public domain (cropped)
- Related lab (ナノ量子物性
（谷口研究室） ): “Quantum dot schema” Gianderiu / CC BY-SA 3.0 (cropped) - Related lab (光ナノ物性
（野村研究室） ): “Lasertests” The Air Force Research Laboratory’s Directed Energy Directorate / Public domain (cropped) - Related lab (ナノフォトニクス
（久保研究室） ): “COVID-19- DOE Response Researchers with UEM microscope ( )” U.S. Department of Energy from United States / Public domain (cropped) - Related lab (ナノ構造物性研究室): “Fullerene-C70-3D-sticks” Jynto (talk) / CC0 (cropped)
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