Highly-sensitive passive integrated optical spiral-shaped waveguide refractometer

G.J. Veldhuis, Paul Lambeck

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    A passive integrated optical waveguiderefractometer based on bendloss changes in a spiral-shaped channel waveguide is proposed and fabricated in Si3N4/SiO2 technology. The experimentally determined performance and the theoretical predictions, based on a simple model for so-called “whispering gallery modes,” agree very well. The minimum detectable refractive index change was measured to be Δn=1.3×10−5.
    Original languageUndefined
    Pages (from-to)2895-2897
    JournalApplied physics letters
    Issue number20
    Publication statusPublished - 1997


    • METIS-111542
    • IR-98127

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