九州大学 エネルギー基盤技術国際教育研究センター

Energy Conservation Technology Division -Shiyoshi YOKOYAMA-

IT Energy Conservation Technology Research Field

Professor

Shiyoshi YOKOYAMA

Specialization

Polymer photonics

Affiliation

Institute for Materials Chemistry and Engineering

Research Topics

  • Nonlinear optical chromophore for the electro-optic application
  • Electro-optic polymer
  • Optical waveguide switching
  • Nanophotonics polymer device
  • Hybrid Si and and polymer optical device

Research Outline

In our laboratory, we aim to realize highly efficient opto-electronic devices based on new exciting organic polymer materials. We are performing distinctive fundamental research for exploring new principle, material (dendrimer, hyperbranch, conjugated photonics polymers, molecules, and so on), chemical, physical property, and nano-photonic phenomenon (photonic crystals and nanophotonic devices), to aim dramatic improvements in the performance of optical electronic devices contributing for low-energy consumption society.
Based on these new material science and technologies, up to the present, we have successfully demonstrated high-efficient organic solid-state lasers, nonlinear optical devices, photonic management, and communication devices.
We want graduate students and postdoctoral researchers of Yokoyama Laboratory to be part of our activities to accomplish our goal.

Structural colors by chiral liquid crystal

Wave guide optical device using electro

By using electro-optic polymer, optical waveguides are fabricated for the range of application.

Schematic illustration of blue phase structure

Optical waveguide array of the EO polymer

Waveguide array of the EO polymer is exploited for the high-performance optical device application.

Polarizing optical micrograph of liquid crystal blue phase

Optical property of EO polymer waveguide

The electro-optic property of the waveguide is measured by fiber-coupling method.