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Evaluation of Nanoplasmonic Optical Fiber Sensors Based on D-Type and Suspended Core Fibers with Metallic Nanowires

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Institute for Plasmas and Nuclear Fusion, Av. Rovisco Pais 1, 1049-0001 Lisboa, Portugal
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Faculty of Exact Sciences and Engineering, University of Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
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Department of Physics and Astronomy, Faculty of Sciences, University of Porto, R. Campo Alegre, 4169-007 Porto, Portugal
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INESC TEC—Center of Applied Photonics, R. Campo Alegre, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(3), 100; https://doi.org/10.3390/photonics6030100
Received: 26 July 2019 / Revised: 7 September 2019 / Accepted: 9 September 2019 / Published: 13 September 2019
The introduction of metallic nanostructures in optical fibers has revolutionized the field of plasmonic sensors since they produce sharper and fine-tuned resonances resulting in higher sensitivities and resolutions. This article evaluates the performance of three different plasmonic optical fiber sensors based on D-type and suspended core fibers with metallic nanowires. It addresses how their different materials, geometry of the components, and their relative position can influence the coupling between the localized plasmonic modes and the guided optical mode. It also evaluates how that affects the spatial distributions of optical power of the different modes and consequently their overlap and coupling, which ultimately impacts the sensor performance. In this work, we use numerical simulations based on finite element methods to validate the importance of tailoring the features of the guided optical mode to promote an enhanced coupling with the localized modes. The results in terms of sensitivity and resolution demonstrate the advantages of using suspended core fibers with metallic nanowires. View Full-Text
Keywords: plasmonic refractive index sensor; optical fiber sensors; surface plasmon resonance; metallic nanowires; D-type fiber; suspended core fiber; finite-element method plasmonic refractive index sensor; optical fiber sensors; surface plasmon resonance; metallic nanowires; D-type fiber; suspended core fiber; finite-element method
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Santos, D.; Guerreiro, A.; Baptista, J.M. Evaluation of Nanoplasmonic Optical Fiber Sensors Based on D-Type and Suspended Core Fibers with Metallic Nanowires. Photonics 2019, 6, 100.

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