2019 Fiscal Year Annual Research Report
光誘起相転移を用いたプラズモニック構造・光導波路による超高速全光変調器
| Project/Area Number |
19J13644
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| Research Institution | The University of Tokyo |
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Principal Investigator |
CLARK JOHN KENJI 東京大学, 工学系研究科, 特別研究員(PD)
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| Project Period (FY) |
2019-04-25 – 2021-03-31
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| Keywords | pump-probe spectroscpy / all-optical / vanadium dioxide / niobium dioxide / ultrafast optics |
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| Outline of Annual Research Achievements |
In the previous year, three key objectives were achieved. First, a unique micro-pump probe spectroscopy setup was completed. The setup has the capability of injecting ultrashort laser pulses into photonic integrated circuits and measuring their time-resolved response. Using a spatial filtering system, the setup can also isolate signals output from specific elements of a photonic integrated circuit. Second, the recovery dynamics of VO2 thin films after excitation by an ultrashort laser pulse were studied. A mid-fluence region where VO2 undergoes a full insulator-metal transition while still exhibiting sub-ns recovery was discovered, thus verifying for the first time that VO2 has the potential to be modulated at GHz speeds. Finally, the photo-induced modulation of NbO2 thin films after excitation by an ultrashort laser pulse was studied and the phenomenological origins of the response was examined in detail. It was found that NbO2 has the potential to be modulated at up to THz speeds given proper management of heat dissipation. Based on this work two journal articles were compiled. One was published in December of 2019 (J. Kenji Clark et al., Phys. Rev. Res. 1, 033168 (2019)) and the other is currently under review in ACS Photonics.
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| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
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| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
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