Ultrahigh sensitivity with different taper geometries of thin-core fiber modal interferometer for refractive index sensing

Ameni Ben Khalifa; Rim Cherif; Amine Ben Salem

doi:10.1117/1.OE.58.2.026109

15 February 2019 Ultrahigh sensitivity with different taper geometries of thin-core fiber modal interferometer for refractive index sensing

Ameni Ben Khalifa, Rim Cherif, Amine Ben Salem

Author Affiliations +

Optical Engineering, Vol. 58, Issue 2, 026109 (February 2019). https://doi.org/10.1117/1.OE.58.2.026109

Abstract

A highly sensitive refractive index sensor based on a fiber in-line Mach–Zehnder interferometer sensor based on single-mode–tapered thin-core–single-mode fiber is proposed. We developed a theoretical model using wide-angle beam propagation method in cylindrical coordinates to simulate light propagation performance of such fiber devices. Tapered structures using different taper geometries (linear, exponential, and parabolic taper) with waist diameters as low as 30 μm are presented. The proposed sensor has an ultrahigh sensitivity of 996.4 nm/refractive index unit in glycerin solution with different concentrations in water using the linear taper geometry. The designed structure presents the merits of high sensitivity, which is 6 times higher than that of the thin-core fiber modal interferometer and makes it an excellent candidate for biochemical sensing applications.

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Ameni Ben Khalifa, Rim Cherif, and Amine Ben Salem "Ultrahigh sensitivity with different taper geometries of thin-core fiber modal interferometer for refractive index sensing," Optical Engineering 58(2), 026109 (15 February 2019). https://doi.org/10.1117/1.OE.58.2.026109

Received: 30 August 2018; Accepted: 24 January 2019; Published: 15 February 2019

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