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Nanostructure Characterization Lab
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A lab that creates electro-optic materials and optical devices that support optical communications.
AboutAbout the lab
Research on materials and devices that support optical communications.
Building on research in materials science and optics, the Nanostructure Characterization Lab studies optical devices useful for optical information and communication technology.
To improve the performance of optical modulation and integrated optical circuits that use electro-optic materials, the lab develops ferroelectric crystals and polymers.
Graduate students belong to the Interdisciplinary Graduate School of Engineering Sciences, Materials Science Course I (Chemistry and Materials Science and Engineering major), and come from a wide range of undergraduate programs in chemistry, physics, electrical, and mechanical fields.
On the lab's website, it is introduced under the name "Shiyoshi Yokoyama Lab."
Key terms
- Electro-optic material
- A substance whose refractive index for light changes when an electric field (voltage) is applied. Used in a waveguide through which light travels, it becomes a high-speed optical modulation device
- Optical modulator
- A device that converts electrical signals into optical signals. It is a key device in optical fiber communication
- Electro-optic polymer
- A polymer-based electro-optic material. It is expected to be a next-generation material because of its high speed, processability, and low cost
ResearchResearch themes
The lab pursues photonics and photonic integration that will support next-generation optical communication device technology. It combines the synthesis of electro-optic crystal films grown with precisely controlled crystal growth and of electro-optic polymers based on molecular design with device design that applies silicon photonic integration technology, and is developing optical modulators capable of ultrahigh-speed optical data transmission.
*Illustrative imageLower-Cost, Energy-Saving Communication Devices
The lab is working on thermal stabilization of electro-optic modulators and on faster, lower-power optical transmission. It achieved 400 Gbit/s in optical transmission experiments, reduced the operating voltage to 1.5 V, and demonstrated operation with excellent environmental resistance.
*Illustrative imageUltrahigh-Speed Optical Data Transmission
In optical data transmission experiments using polymer hybrid modulators, the lab generated signals of up to 120 Gbit/s. By applying multilevel modulation, it has also succeeded in transmitting 200 Gbit/s signals.
MembersFaculty
Members of the Nanostructure Characterization Lab consist of faculty members, academic researchers, and doctoral and master's students.
- ProfessorShiyoshi Yokoyama
- Associate ProfessorGuo Wei Lu
- Assistant ProfessorKo Sato
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: “WaveguideJ-Band” Muraer / CC BY-SA 3.0 (cropped)
- Lower-Cost, Energy-Saving Communication Devices: “base station and antenna by Wireless City Planning” Yoh-Plus / CC BY 4.0 (cropped)
- Ultrahigh-Speed Optical Data Transmission: “Optical fiber cable-07ASD” Asurnipal / CC BY-SA 4.0 (cropped)
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