| Project/Area Number |
20K15145
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28050:Nano/micro-systems-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
Pin Christophe 北海道大学, 電子科学研究所, 助教 (50793767)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | vanadium dioxide / Mott transition / nonlinear optical force / spin-orbit coupling / nanoparticle rotation / hydrothermal synthesis / plasmonic nano-switch / angular momentum / optical tweezers / electronic nano-switch / nanoparticle deposition |
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| Outline of Research at the Start |
二酸化バナジウム（VO2）は、絶縁体-金属相転移が室温付近かつ低電圧で制御できるため有望な材料となっております。ナノスケールサイズでの加工ができると、超高速の電子応答、僅かな原材料、低消費電力なスイッチング電子デバイスが実現されます。本申請研究では、プラズモニックナノギャップアンテナを用いてVO2 ナノ粒子を所望の位置で捕捉・設置することにより、VO2 の単一ナノ粒子スイッチングデバイスの実現を目指します。金ナノアンテナの光学的、熱的、電気的応答を最適化した後、VO2スイッチング素子の製造と各種の特性評価を行います。
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| Outline of Final Research Achievements |
Optical manipulation of vanadium dioxide (VO2) nanoparticles was investigated for the first time. Nonlinear optical trapping due to the heat-induced phase transition of VO2 was demonstrated using focused Gaussian and Laguerre-Gaussian beams. Orbital rotation of trapped particles was achieved by using a circularly polarized laser beam. The spin-to-orbital angular momentum conversion mechanism was found to rely on the directive light scattering induced by Mie resonances. Rotation direction control was achieved, and rotation direction reversal was demonstrated during the growth of VO2 nanoparticles.
Laser-induced hydrothermal synthesis of VO2 was used to fabricate 1-micrometer-large VO2 microdisks on alumina-coated gold thin films. Gold-VO2 hetero-nanostructures (VO2 nanoshell on gold nanodisks) were fabricated by plasmon-assisted hydrothermal synthesis of VO2. Plamonic-resonance-induced enhancement of the vanadium oxide synthesis was demonstrated.
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| Academic Significance and Societal Importance of the Research Achievements |
New fabrication techniques of vanadium dioxide (VO2) nanodevices are important for the fabrication of ultrafast, low-energy electronic or optical switching devices. New optical manipulation techniques are important to further understand interactions between light and nanoparticles.
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