2021 Fiscal Year Final Research Report
Extraordinary plasmon instabilities in graphene Dirac Fermions and their terahertz functional device applications
Project/Area Number |
20K20349
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Project/Area Number (Other) |
18H05331 (2018-2019)
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Research Category |
Grant-in-Aid for Challenging Research (Pioneering)
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Allocation Type | Multi-year Fund (2020) Single-year Grants (2018-2019) |
Review Section |
Medium-sized Section 21:Electrical and electronic engineering and related fields
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Research Institution | Tohoku University |
Principal Investigator |
OTSUJI Taiichi 東北大学, 電気通信研究所, 教授 (40315172)
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Co-Investigator(Kenkyū-buntansha) |
岩月 勝美 東北大学, 電気通信研究機構, 特任教授 (00590522)
佐藤 昭 東北大学, 電気通信研究所, 准教授 (70510410)
渡辺 隆之 東北大学, 電気通信研究所, 助教 (80771807)
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Project Period (FY) |
2018-06-29 – 2022-03-31
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Keywords | グラフェン / プラズモン / 不安定性 / テラヘルツ |
Outline of Final Research Achievements |
In this study, we have developed a model theory based on our original hypothesis for the "anomalous instability of graphene plasmon," which cannot be explained by conventional theories, as if it transcends the physical property limit of graphene, and clarified the theory by building a prototype device with an original structure and experimentally verifying the device. Furthermore, we have successfully demonstrated terahertz amplification and coherent oscillation devices that can be operated at room temperature, which have been difficult to realize in both conventional electronic and photonic devices, by introducing graphene plasmon anomalous instability.
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Free Research Field |
テラヘルツ光電子工学
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Academic Significance and Societal Importance of the Research Achievements |
本研究で推進したグラフェンディラックフェルミオンの“プラズモン不安定性”に関する最新の実験結果において,従来の理論では説明不可能な巨大利得増強作用や自励発振現象が生じることを発見した.この一見不合理とも思える,しかし実験的に明確に観測された現象に対して理論的根拠を与えること,そしてそれを種々の条件下で実験検証したことは,従来の常識を覆し,従来の理論体系を超越し,未開拓テラヘルツ電磁波領域で従来技術が成し得なかった巨大増幅や超高効率光テラヘルツ波周波数変換を実現し,次世代超高速無線通信での応用が期待されるテラヘルツデバイス工学を飛躍的に発展させるものであり,学術的にも社会的にも高い意義を有する.
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