High speed graphene based optical modulators and photodetectors on silicon waveguides

2018 Fiscal Year Annual Research Report

• Project/Area Number: 17J09162
• Research Institution: The University of Tokyo
• Principal Investigator: Kovacevic Goran 東京大学, 工学系研究科, 特別研究員(DC2)
• Project Period (FY): 2017-04-26 – 2019-03-31
• Keywords: Silicon Photonics / Graphene / Optical Modulator / Pulsed Fiber Laser / Waveguides / Mode-locking

Outline of Annual Research Achievements

I successfully designed an ultra-fast graphene optical modulator on Si waveguide, supplemented with rigorous numerical simulations and RC circuit characterization. This design culminated in an accepted paper in the APEX journal of the Japanese Society for Applied Physics, Impact Factor, 2.667, with Acknowledgment to JSPS. In addition to this, I utilized the previously obtained fabrication skills to fabricate an integrated passive saturable absorber with graphene on silicon waveguides. I used the e-beam litography and wet etch process to develop waveguides. Graphene was transfered in the wet transfer processed using a PMMA coating, and patterned in e-beam litography. For the first time I showed different behaviour of the mode locked pulse in different lengths of graphene in a Si photonic chip. This was a stepping stone in fabricating the proposed/designed ultra high speed graphene modulator as I was able to succesfully fabricate waveguides, transfer and pattern graphene. This research was published in the Japanese Journal of Applied Physics, with an acknowledgment to JSPS. The fabrication of the full modulator is left for the future research which will be taken over by my peers. In addition to 2 journal publication, my research was presented at 4 conferences, with references to JSPS.

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Ultra high-speed graphene optical modulator design based on tight field confinement in a slot waveguide (2018)
  • Author(s): Goran Kovacevic, Christopher Phare, Sze Set, Michal Lipson, Shinji Yamashita
  • Journal Title: Applied Physics Express Volume: 11 Pages: 065102
  • DOI: https://doi.org/10.7567/APEX.11.065102
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Patterned graphene on SiN waveguides for mode locking of fiber lasers (2018)
  • Author(s): Goran Kovacevic, Takuma Shirahata, Bingchang Wu, Pengtao Yuan, Ting-Hui Xiao, Lei Jin, Taiki Inoue, Shigeo Maruyama, Zhenzhou Cheng, Sze Y. Set, and Shinji Yamashita
  • Journal Title: Japanese Journal of Applied Physics Volume: 57 Pages: 102701
  • DOI: https://doi.org/10.7567/JJAP.57.102701
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Patterned Graphene on SiN Waveguides with NPR for Fiber Laser Mode-Locking (2018)
  • Author(s): Goran Kovacevic, Takuma Shirahata, Bingchang Wu, Ting-Hui Xiao, Lei Jin, Taiki Inoue, Shigeo Maruyama, Zhenzhou Cheng, Sze Y. Set, and Shinji Yamashita
  • Organizer: Frontiers in Optics 2018
  • Int'l Joint Research
• [Presentation] Influence of Intra-Cavity Loss on Mode-Locking of Fiber Lasers (2018)
  • Author(s): Goran Kovacevic, Takuma Shirahata, Pengtao Yuan, Sze Yun Set, and Shinji Yamashita
  • Organizer: Conference on Lasers and Electro-Optics/Pacific Rim 2018
  • Int'l Joint Research
• [Presentation] Mode locking of fiber lasers using patterned graphene on SiN waveguides (2018)
  • Author(s): Goran Kovacevic、Takuma Shirahata、Bingchang Wu、Pengtao Yuan、Ting-Hui Xiao、Lei Jin、Taiki Inoue、Shigeo Maruyama、Zhen Zhou Cheng、Sze Set、Shinji Yamashita
  • Organizer: Proceedings in JSAP autumn meeting, Nagoya, Japan
• [Presentation] Study of High Loss Fiber Laser Cavities Mode-Locked by NPR (2018)
  • Author(s): Goran Kovacevic、Pengtao Yuan、Sze Set、Shinji Yamashita
  • Organizer: JSAP Spring Meeting