Refractive index sensing in an all-solid twin-core photonic bandgap fiber

Wu Yuan*, Graham E. Town, Ole Bang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    62 Citations (Scopus)


    We describe a highly sensitive refractive index sensor based on a twin-core coupler in an all-solid photonic bandgap guiding optical fiber. A single hole acts as a microfluidic channel for the analyte, which modifies the coupling between the cores, and avoids the need for selective filling. By operating in the bandgap guiding regime the proposed sensor is capable of measuring refractive indices around that of water, and because the analyte varies the coupling coefficient (i.e., instead of phase matching condition) the device is capable of both high sensitivity and a relatively large dynamic range.

    Original languageEnglish
    Article number5466487
    Pages (from-to)1192-1199
    Number of pages8
    JournalIEEE Sensors Journal
    Issue number7
    Publication statusPublished - 2010


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