Development of a TiO2/SiO2 waveguide-mode chip for an ultraviolet near-field fluorescence sensor

Chiaki Kuroda, Midori Nakai, Makoto Fujimaki, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    2 Citations (Scopus)


    Aimed at detecting fluorescent-labeled biological substances sensitively, a sensor that utilizes near-field light has attracted much attention. According to our calculations, a planar structure composed of two dielectric layers can enhance the electric field of UV nearfield light effectively by inducing waveguide-mode (WM) resonance. The fluorescence intensity obtainable by a WM chip with an optimized structure is 5.5 times that obtainable by an optimized surface plasmon resonance chip. We confirmed the above by making a WM chip consisting of TiO2 and SiO2 layers on a silica glass substrate and by measuring the fluorescence intensity of a solution of quantum dots dropped on the chip.

    Original languageEnglish
    Pages (from-to)6796-6805
    Number of pages10
    JournalOptics Express
    Issue number6
    Publication statusPublished - 2018 Mar 19

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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