Etched multimode microfiber knot-type loop interferometer refractive index sensor |
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Authors: | Pal Sudipta Sarkar Mondal Samir K Tiwari Umesh Swamy P Venu Gopala Kumar Manish Singh Nahar Bajpai P P Kapur Pawan |
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Affiliation: | Central Scientific Instrument Organization (Council of Scientific and Industrial Research), Sector 30C, Chandigarh 160030, India. |
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Abstract: | We propose a novel refractive index sensor based on multimode microfiber knot-type loop (NL) interferometer. The middle portion (~5 cm) of a 15 cm long multimode fiber is etched in 48% hydrofluoric acid to reduce its diameter to ~12 μm. A NL of diameter <1 mm is made from the etched fiber. The ends of etched fiber are spliced with single-mode fibers for launching and detecting light from the NL interferometer. The NL introduces path differences to produce interferometric spectra with free spectral range ~16 nm. The spectrum shifts as the surrounding refractive index of the loop is changed by adding chemicals. We observe the highest sensitivity of the NL interferometer ~172 nm/RIU (refractive index unit) at a refractive index value 1.370 as obtained experimentally using commonly available chemicals. The design could be used as simple, low cost, and highly sensitive biological and chemical sensor. |
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