Kyushu University Academic Staff Educational and Research Activities Database
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Shiyoshi Yokoyama Last modified date:2020.10.07

Graduate School
Undergraduate School

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Academic Degree
Degree of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Organic and polymer materials, photonic polymer, optoelectronics
Total Priod of education and research career in the foreign country
Outline Activities
Rresearch focuses on the interdisciplinary field of molecular and polymeric materials with particular emphasis on high technology electro-optic and photonic materials and emphasis on novel photonic polymer device construction technologies. After careful control of molecular design and synthesis, research result dealts with high-performance topics including electro-optic ultra-fast switching, solid-state polymer laser, and polymer photonic crystals for low power operation. Though these polymer materials and optical devices have been considered as a future technology, it is becoming important recently because materials can provide much easier processing capability with promising properties compared with inorganic processes. Research is employed to approach “molecular engineering” to tailor size, shape, sequence, and functionality of organic and polymeric materials and explore their applications to:
・Electro-optic polymers for high-speed communications technology
・Polymer solid-state photonics device
・Fabrication of nano-micro scale polymer optical structures
To complements these efforts, research maintain state-of-the-art research fields in materials chemistry, photonics, and polymer nanao-micro scale manufacturing.
Research Interests
  • 1. Organic and polymer materials for optoelectronic applications
    2. Fabrication of polymer devices
    3. Optical polymer waveguide devices
    4.Polymer photonic crystals
    keyword : Electro optic polymer, Hyperbranched polymer, Molecular hyperpolarizability, Nonlinear optical chromophore, Polmer nano-fabrication, High-speed moduration, Optical swiching, Low energy consumption
Academic Activities
1. Hiromu Sato, Hiroki Miura, QIU FENG, Andrew Mark Spring, Tsubsa Kashino, Takamasa Kikuchi, Masaako Ozawa, Keisuke Odoi, Shiyoshi Yokoyama, Low Driving Voltage Mach-Zehnder Interference Modulator Constructed from an Electro-optic Polymer on Ultr-thin Silicon with a Broadband Operation, Optics Express,, 25, 768-775, 2017.01.
2. QIU FENG, Hiroki Miura, Andrew Mark Spring, Daisuke Maeda, Masaaki Ozawa, Jianxun Hong, Keisuke Odoi, Shiyoshi Yokoyama, An electro-optic polymer-cladded TiO2 waveguide modulato, Appl. Phys. Lett.,, 109, 173301-1-173301-4, 2016.10.
3. Andrew Mark Spring, QIU FENG, Shiyoshi Yokoyama, High stability poly(N-adamantyl-exo-norbornene-5,6-dicarboximide) and phenyl vinylene thiophene electro-optic host-guest system, European Polymer Journal, 84, 89-99, 2016.09.
4. QIU FENG, Shiyoshi Yokoyama, Efficiently poled electro-optic polymer modulators, Optics Express, 24, 19020-19025, 2016.08.
5. QIU FENG, Andrew Mark Spring, Hiroki Miura, Daisuke Maeda, Masa-aki Ozawa, Keisuke Odoi, Shiyoshi Yokoyama, Athermal Hybrid Silicon/Polymer Ring Resonator Electro-optic Modulator, ACS Photonics , 10.1021/acsphotonics.5b00695, 3, 780-783, 2016.04.
6. Qiu Feng, Hiromu Sato, Andrew M. Spring, Daisuke Maeda, Masa-aki Ozawa, Keisuke Ozawa, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Ultra-thin silicon/electro-optic polymer hybrid waveguide modulators, Appl. Phys. Lett., 10.1063/1.4931490, 107, 123302-1-123302-5, 2015.09.
7. Qiu Feng, Andrew M. Spring, Shiyoshi Yokoyama, Athermal and high-Q hybrid TiO2–Si3N4 ring resonator via an etching-free fabrication technique, ACS Photonics, 10.1021/ph500450n, 2, 405-409, 2015.04.
8. Qiu Feng, Andrew M. Spring, Disuke Maeda, Masaaki Ozawa, Keisuke Odoi, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, A hybrid electro-optic polymer and TiO2 double-slot waveguide modulator, Scientific Reports, 10.1038/srep08561, 5, 8561-1-8561-6, 2015.03, 酸化チタン細線導波路と電気光学ポリマーを使ったハイブリッド光変調デバイスを作製し、理論的な解析と光学計測によって優れた光学特性を評価した。光導波路の電気光学定数は140pm/Vであり、ダブルスロット構造を持つ光導波路内で光変調特性が増強していることを明にした。また、光変調の動作電圧は1.6Vであり、従来の無機系光変調デバイスを凌駕する低電力動作も確認された。.
9. Andrew M. Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Qiu Feng, Kazuhiro Yamamoto, Shiyoshi Yokoyama, An Analysis of the Structural, Thermal and Optical Characteristics as well as the Electrical Resistivity of tert-butyldiphenylsilyl Substi-tuted Poly(norbornene-dicarboximide)s, Polymer, 56, 189-198, 2014.12.
10. Andrew M. Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Qiu Feng, Kazuhiro Yamamoto, Shiyoshi Yokoyama, Glass Transition Temperature Control by Poly(norbornene-dicarboximide) Copolymers, Polymer Bulletin, 10.1007/s00289-014-1283-2, 2014.11.
11. QIU FENG, SPRING ANDREW, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi, Akira Otomo, Shiyoshi Yokoyama, A Straightforward Electro-optic Polymer Covered Titanium Dioxide Strip Line Modulator with a Low Driving Voltage, Applied Physics Letters, 105, 073305-1-073305-4, 2014.08.
12. Qiu Feng, Andrew M. Spring, D. Maeda, M. Ozawa, K. Odoi, I. Aoki, A. Otomo, Shiyoshi Yokoyama, TiO2 ring-resonator-based EO polymer modulator, Optics Express, 22, 14101-14107, 2014.06.
13. Qiu Feng, Andrew Spring, Yu Feng, Isao Aoki, Akira Otomo, Shiyoshi Yokoyama, Electro-optic polymer / titanium dioxide hybrid core ring resonator modulators, Laser Photoncis Revew, 7, 84-88, 2013.11.
14. Feng Yu, A. M. Spring, Lu Li, Feng Qiu, Kazuhiro Yamamoto, Daisuke Maeda, Masaaki Ozawa, Keisuke Oodoi, Shiyoshi Yokoyama, An Enhanced Host-guest Optical Polymer System using Poly(norbornene-dicarboximide) via ROMP, J. Polym. Scie. A, 51, 1278-2184, 2012.12.
Membership in Academic Society
  • The Society of Polymer Science
  • Japanese Society of Applied Physics