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  • Title: Optical nanofocusing by tapering coupled photonic-plasmonic waveguides.
    Author: He X, Yang L, Yang T.
    Journal: Opt Express; 2011 Jul 04; 19(14):12865-72. PubMed ID: 21747437.
    Abstract:
    We have numerically designed a compact structure to concentrate optical waves from a silicon-on-insulator waveguide to a deep sub-wavelength and high intensity surface plasmon focal spot at the tip of a metallic strip taper. A systematic design approach is developed to obtain an optimal photon-surface plasmon side coupling efficiency of up to 50% at 1.55 μm wavelength, and an over 50 times increase in electric field intensity in a focal region of around 20nm × 20nm × 7nm in size. The length of the whole device is 2.2 μm. We expect fabrication of the proposed device to be simpler than devices in previous work.
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