Sensitivity enhancement in evanescent optical waveguidesensors

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

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    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
    Issue numbervol 18
    Publication statusPublished - 2000


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

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