Sensitivity enhancement in evanescent optical waveguidesensors

G.J. Veldhuis, O. Parriaux, Hugo Hoekstra, Paul Lambeck

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    Abstract

    It is shown, that the sensitivity of the effective refractive index on the cladding index in evanescent optical waveguide sensors, can be larger than unity. This implies that the attenuation of a guided wave propagating in a waveguide immersed in an absorptive medium can be made larger than that of a free-space wave propagating through the same medium. The conditions and physical explanation for this puzzling behavior are identified and as a practical application, an absorption sensor, based on a suspended silicon slab waveguide, is proposed where the sensitivity is enhanced by a factor of 1.35
    Original languageUndefined
    Pages (from-to)677-682
    Number of pages5
    JournalJournal of lightwave technology
    Volume18
    Issue numbervol 18
    DOIs
    Publication statusPublished - 2000

    Keywords

    • METIS-112089
    • Chemical sensing
    • IR-15214
    • refractometry
    • evanescent field sensing
    • Integrated Optics

    Cite this

    Veldhuis, G. J., Parriaux, O., Hoekstra, H., & Lambeck, P. (2000). Sensitivity enhancement in evanescent optical waveguidesensors. Journal of lightwave technology, 18(vol 18), 677-682. https://doi.org/10.1109/50.842082