Shape-sensitive reflectance by nanostructured metal attached on an optical waveguide-mode sensor

Kazuki Sato, Yoshimichi Ohki, Ken Ichi Nomura, Makoto Fujimaki, Koichi Awazu

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The optical reflectance of He-Ne laser light on a waveguide-mode sensor was measured as a function of light incident angle, in the case of either a metal (Au, Cr or Pt) film or nanoparticles being attached to the waveguide surface of the sensor. A dip appears in the reflectance spectrum as a function of incident angle at the angle where waveguide-mode excitation is induced. It is found that the dip moves toward a lower angle in the case that the attached metal is of a film shape, while it shifts toward a higher angle when the metal is an ensemble of nanoparticles. This difference in the direction of shift can be explained well by theoretical calculations using average refractive indices of the metal-containing layers. The present result indicates that one can estimate whether a metal nanostructure is film-like or an ensemble of spherical nanoparticles by the sensor.

    Original languageEnglish
    Article number245503
    JournalNanotechnology
    Volume22
    Issue number24
    DOIs
    Publication statusPublished - 2011 Jun 17

    Fingerprint

    Optical waveguides
    Laser modes
    Metals
    Sensors
    Waveguides
    Nanoparticles
    Nanostructures
    Refractive index
    Lasers

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Mechanics of Materials
    • Materials Science(all)

    Cite this

    Shape-sensitive reflectance by nanostructured metal attached on an optical waveguide-mode sensor. / Sato, Kazuki; Ohki, Yoshimichi; Nomura, Ken Ichi; Fujimaki, Makoto; Awazu, Koichi.

    In: Nanotechnology, Vol. 22, No. 24, 245503, 17.06.2011.

    Research output: Contribution to journalArticle

    Sato, Kazuki ; Ohki, Yoshimichi ; Nomura, Ken Ichi ; Fujimaki, Makoto ; Awazu, Koichi. / Shape-sensitive reflectance by nanostructured metal attached on an optical waveguide-mode sensor. In: Nanotechnology. 2011 ; Vol. 22, No. 24.
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