Fiber optic refractive index sensor based on tapered thin core fiber

Ameni Ben Khalifa; Amine Ben Salem; Rim Cherif

doi:10.1117/12.2273815

23 August 2017 Fiber optic refractive index sensor based on tapered thin core fiber

Ameni Ben Khalifa, Amine Ben Salem, Rim Cherif

Proceedings Volume 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI; 103820D (2017) https://doi.org/10.1117/12.2273815
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

In this paper, we propose the design of fiber optic refractive index sensor based on a thin core fiber, sandwiched between an input and output single mode fibers. This structure is characterized by a refractive index sensitivity about 187.98 nm/RIU (refractive index unit). In order to enhance the sensitivity, we designed a tapered single mode-thin core-single mode fiber structure where the sensitivity with different waist-diameters (90, 60 and 30 μm) is investigated. As a result, we obtained an ultra-high sensitivity of the tapered sensor about 783.19 nm/RIU in the refractive index range of 1.3346-1.3899, using sucrose and water mixture solution, achieved for a waist diameter equal to 30 μm and a taper length of 675μm.The designed structure presents the merits of high sensitivity which is 4 times higher than that of the thin core fiber modal interferometer which makes it an excellent candidate for biochemical sensing applications.

Citation Download Citation

Ameni Ben Khalifa, Amine Ben Salem, and Rim Cherif "Fiber optic refractive index sensor based on tapered thin core fiber", Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 103820D (23 August 2017); https://doi.org/10.1117/12.2273815

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