| 研究実績の概要 |
In the past year, 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.
Additionally, as I initially stated in my research plan for JSPS, my plan is to fabricate the designs of the modulator and other graphene enhanced integrated devices. In the past year I obtained access to the clean room facilities of the University of Tokyo and have started with fabrication. As of recently, I am able to fabricate Si waveguides with low coupling loss as well as to perform graphene transfer and patterning which is required for graphene based devices. In doing this I am performing e-beam lithography, ICP plasma etching, as well as chemical processing. I am also well versed currently in using the advanced characterization equipment, like SEM, profilometer, etc.
Since our laboratories main focus is the mode-locked fiber lasers, I came up with the way, with my supervisor, to combine my research of graphene enhanced silicon photonics with fiber lasers, in that we can mode lock cavities with my integrated devices, as an interim results. To that extant, I have built an experimental setup that combines the fiber laser and chip coupling, and am currently performing experiments.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The progress is on schedule with respect to developing fabrication skills and generating impactful output with respect to graphene based integrated Si modulators. Since I am performing experiments currently on the structures I've made I am satisfied with that progress, but I did hope I could excel more with the complexity of the structures I can make. I realized the development of clean room processes takes longer time than expected, so I am unable to fabricate very complicated devices yet, while still being able to fabricate more basic ones which I can use in experiments (i.e. graphene covered silicon waveguides).
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| 今後の研究の推進方策 |
The future research plan consists of further development of fabrication skill and fabricating more complicated devices. These devices include silicon slot waveguides, which I've proved through designs can be very useful in graphene based modulation, as well as fabricating electrodes (a requirement of graphene modulators and any other active graphene based devices). I have already ordered the resists required to achieve electrode lift-off, and expect to start working on this by the end of May.
Additionally, I plan to fully develop the fiber laser setup I developed, that contains the chip-coupling region, where I can combine graphene enhanced Si chips with fiber lasers. With this setup, I will be able to obtain new results in fiber lasers every time I develop my fabrication skill, as each update in device complexity I can fabricate can be an added benefit for the fiber laser performance.
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