Sensitivity to refractive index of high-aspect-ratio nanofins with optical vortex

Etsuo Maeda, Yaerim Lee, Youjiro Kobayashi, Akiko Taino, Mari Koizumi, Shigenori Fujikawa, Jean Jacques Delaunay

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    An easy and large-scale fabrication technique of metal fins was used to produce periodic Au fin arrays that realized light confinement in the near-infrared region. Light confinement was revealed by vortex patterns in the optical power flow of an array of high-aspect-ratio fins (height of 1000 nm for a width of 50 nm). The light confinement resulted in sharp dips in the reflectance spectrum of the high-aspect-ratio fin array. The wavelengths of the reflectance dips were found to shift toward higher values when the refractive index of the surrounding medium was increased. Experimental and simulated dip shift values were in good agreement with a demonstrated sensitivity of 580 nm per refractive index unit.

    Original languageEnglish
    Article number505502
    Issue number50
    Publication statusPublished - Dec 21 2012

    All Science Journal Classification (ASJC) codes

    • Bioengineering
    • General Chemistry
    • General Materials Science
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering


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