Enhanced near-field properties of a gap of TiO 2 nanosphere pairs for 3D photocatalytic optical trap

Toshiyuki Honda, Mitsuhiro Terakawa, Minoru Obara

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Localized near field on a nanostructure has been attracting much attention for a template for size-selective optical trapping beyond the diffraction limit. The near-field optical trapping has mainly been studied by using metallic substrates such as Au nanodot pairs, periodic Al nanoslits, and nanoapertures in an Au film. In this paper, we newly design a Miescattered near-field optical trapping scheme for size-selective photocatalysis by using pairs of poly-rutile TiO 2 nanospheres. The optical intensity distribution in a gap between the nanospheres was simulated by a FDTD (Finite- Difference Time-Domain) method. The simulation system consists of two nanospheres of 240 nm in diameter placed on a silica substrate in water. The 400 nm excitation laser is used for both the near-field generation and the photocatalyst pumping. The optical force for the trapping was calculated based on the near-field intensity distribution. The results suggest that the optical force generated by the proposed system is sufficient for near-field optical trapping which provides size-selective photocatalysis for killing virus, etc.

    Original languageEnglish
    Title of host publicationComplex Light and Optical Forces VI
    Publication statusPublished - 2012 Mar 2
    EventComplex Light and Optical Forces VI - San Francisco, CA, United States
    Duration: 2012 Jan 252012 Jan 26

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    ISSN (Print)0277-786X


    OtherComplex Light and Optical Forces VI
    CountryUnited States
    CitySan Francisco, CA


    • Near field
    • Optical trapping
    • Size-selective photocatalysis
    • TiO

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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