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Watanabe Lab
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The lab explores new semiconductor devices for light and electrons using nanostructures.
AboutAbout the lab
Bringing light and electrons together on silicon.
The Watanabe Lab studies high-performance information-processing devices based on new physics enabled by nanotechnology.
The lab also aims to realize lasers built on silicon that can be integrated together with optical and electronic components.
The key is structures that control different materials, namely metals, insulators, and semiconductors, at nanometer dimensions with atomic-level junctions in mind.
The lab investigates how electrons are transported in these structures and how they interact with light, and clarifies the principles and structures of devices that can reach their ultimate performance limits.
Key terms
- Quantum well
- A structure that confines electrons in an extremely thin semiconductor layer so that they can only have discrete energy levels
- Quantum cascade laser
- A laser that emits light using electrons alone, producing light when electrons move between energy steps within quantum wells
- Resonant tunneling diode
- An extremely fast-switching device that makes use of the phenomenon in which electrons pass through a thin barrier because of their quantum properties
NewsLab news
View More ↗ResearchResearch themes
The lab studies how to build optical and electronic devices that make use of quantum effects on silicon substrates, using structures in which different materials are controlled at nanometer dimensions. The lab has the technology to stack extremely thin layers of insulators such as calcium fluoride on silicon substrates.
*Illustrative imageQuantum cascade lasers on silicon
This research aims to build lasers on silicon substrates that emit light using electrons alone. An advantage is that the emission wavelength can be freely designed by changing the thickness of the quantum well films.
*Illustrative imageQuantum effect devices on silicon
This research aims to realize ultrafast-switching resonant tunneling diodes on silicon substrates. Thin films of calcium fluoride and cadmium fluoride are used as materials.
*Illustrative imageHigh-speed, highly integrated logic devices and memory
The lab studies a charge-storage nonvolatile memory (RT-RAM) that conversely exploits the memory effect of resonant tunneling diodes. It also develops circuit design and integration process technologies.
MembersFaculty
The members of the Watanabe Lab consist of faculty, doctoral, master's, and undergraduate students, and assistant staff.As of 2026
- Associate ProfessorMasahiro WatanabePublications ↗
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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: “12-inch silicon wafer” Peellden / CC BY-SA 3.0 (cropped)
- Quantum cascade lasers on silicon: “Laser diode with case cut away” Arconsoli / CC BY-SA 4.0 (cropped)
- Quantum effect devices on silicon: “5C2A5953R - – Silicon Wafer 20200519” Rob Bulmahn / CC BY 2.0 (cropped)
- High-speed, highly integrated logic devices and memory: “MF30011R 1702-2 die” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Koyama Lab): “Laser table” Pawel Nowakowski / CC BY-SA 4.0 (cropped)
- Related lab (Ohmi Lab): “Ehysteresis” Ndthe / CC BY 3.0 (cropped)
- Related lab (Okada Lab): “07R01” Mister rf / CC BY-SA 4.0 (cropped)
- Related lab (Nakamura Lab): “Ultrasonic motor” Yorkshire Terrier / Public domain (cropped)
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