Etched multimode microfiber knot-type loop interferometer refractive index sensor

Pal, Sudipta Sarkar; Mondal, Samir K.; Tiwari, Umesh; Swamy, P. Venu Gopala; Kumar, Manish; Singh, Nahar; Bajpai, P. P.; Kapur, Pawan
September 2011
Review of Scientific Instruments;Sep2011, Vol. 82 Issue 9, p095107
Academic Journal
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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