Multifunctional waveguide interferometer sensor: Simultaneous detection of refraction and absorption with size-exclusion function

Chen Zhou*, Mehdi Keshavarz Hedayati, Anders Kristensen

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    A waveguide Young interferometer is presented with simultaneous detection of complex refractive index of a liquid sample. The real part of the refractive index change (refraction) is detected by tracing phase shifts of the interferogram generated by a sensing and reference waveguide. The imaginary part of the refractive index (absorption) is determined by the attenuation of the transmitted signal at certain wavelength. Furthermore, nano-filters are fabricated atop the sensing waveguide, which enables size-exclusion filtering of species to the evanescent field. It shows capability of distinguishing small and large particles from 100 nm to 500 nm in diameter, which is further confirmed by fluorescent excitation experiments. The present sensor could find broad application in optical characterization of complex turbid media with regard to their complex refractive index.
    Original languageEnglish
    JournalOptics Express
    Volume26
    Issue number19
    Pages (from-to)24372-24383
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2018

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