15 February 2019 Ultrahigh sensitivity with different taper geometries of thin-core fiber modal interferometer for refractive index sensing
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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.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE
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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CITATIONS
Cited by 2 scholarly publications.
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KEYWORDS
Refractive index

Interferometers

Sensors

Structured optical fibers

Cladding

Single mode fibers

Beam propagation method

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