Detection of colored nanomaterials using evanescent field-based waveguide sensors

Makoto Fujimaki, Ken Ichi Nomura, Kazuki Sato, Takafumi Kato, Subash C B Gopinath, Xiaomin Wang, Koichi Awazu, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    40 Citations (Scopus)

    Abstract

    We have developed an optical system designed for detecting colored nanomaterials in aqueous solutions, using the concept of evanescent-field- coupled waveguide-mode sensors. In this study, we found that the waveguide modes induced in the sensor are intrinsically sensitive to a change in optical absorption, or a 'change in color'. The system detects less than one gold nanoparticle (diameter: 20 nm) adsorbed per square micrometer. It is also demonstrated that significant signal enhancement due to adsorption of molecules is achieved using a dye. The developed sensor rarely suffers from a drawback of impurity adsorption. The system is expected to be applied as an effective sensing tool for metal colloids, nanoparticles, and colored biomolecules in solution.

    Original languageEnglish
    Pages (from-to)15732-15740
    Number of pages9
    JournalOptics Express
    Volume18
    Issue number15
    DOIs
    Publication statusPublished - 2010 Jul 19

    Fingerprint

    waveguides
    sensors
    nanoparticles
    adsorption
    colloids
    micrometers
    optical absorption
    dyes
    gold
    aqueous solutions
    color
    impurities
    augmentation
    metals
    molecules

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Fujimaki, M., Nomura, K. I., Sato, K., Kato, T., Gopinath, S. C. B., Wang, X., ... Ohki, Y. (2010). Detection of colored nanomaterials using evanescent field-based waveguide sensors. Optics Express, 18(15), 15732-15740. https://doi.org/10.1364/OE.18.015732

    Detection of colored nanomaterials using evanescent field-based waveguide sensors. / Fujimaki, Makoto; Nomura, Ken Ichi; Sato, Kazuki; Kato, Takafumi; Gopinath, Subash C B; Wang, Xiaomin; Awazu, Koichi; Ohki, Yoshimichi.

    In: Optics Express, Vol. 18, No. 15, 19.07.2010, p. 15732-15740.

    Research output: Contribution to journalArticle

    Fujimaki, M, Nomura, KI, Sato, K, Kato, T, Gopinath, SCB, Wang, X, Awazu, K & Ohki, Y 2010, 'Detection of colored nanomaterials using evanescent field-based waveguide sensors', Optics Express, vol. 18, no. 15, pp. 15732-15740. https://doi.org/10.1364/OE.18.015732
    Fujimaki M, Nomura KI, Sato K, Kato T, Gopinath SCB, Wang X et al. Detection of colored nanomaterials using evanescent field-based waveguide sensors. Optics Express. 2010 Jul 19;18(15):15732-15740. https://doi.org/10.1364/OE.18.015732
    Fujimaki, Makoto ; Nomura, Ken Ichi ; Sato, Kazuki ; Kato, Takafumi ; Gopinath, Subash C B ; Wang, Xiaomin ; Awazu, Koichi ; Ohki, Yoshimichi. / Detection of colored nanomaterials using evanescent field-based waveguide sensors. In: Optics Express. 2010 ; Vol. 18, No. 15. pp. 15732-15740.
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