2022 Fiscal Year Final Research Report
Fabrication and characterization of a single-VO2-nanoparticle electronic nano-switch device
| 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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| Keywords | vanadium dioxide / Mott transition / nonlinear optical force / spin-orbit coupling / nanoparticle rotation / hydrothermal synthesis / plasmonic nano-switch |
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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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| Free Research Field |
Optics
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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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