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Analysis of a Single Solid Core Flat Fiber Plasmonic Refractive Index Sensor

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Abstract

In this article, a single solid core flat fiber (SSCFF) refractive index sensor based on surface plasmon resonance (SPR) is proposed and analyzed numerically using the finite element method (FEM). The proposed flat fiber consists of a single array of five circular holes. Among them the central hole is made of GeO2-doped silica which is forming the core. Other holes are filled with air and situated symmetrically on both sides of the central solid core. The upper flat surface of the fiber is coated with a thin plasmonic gold layer which is protected by an active titanium dioxide layers. Analyte is situated on top of these layers. The wavelength interrogation technique is applied to study the coupling characteristics between the core-guided mode and the surface plasmon mode as well as for the refractive index measurement. Numerical analysis results show that this sensor is able to detect high refractive index analytes from 1.49 to 1.54 with a good linear response. Additionally, the dependence of surface plasmonic resonance wavelength on analyte refractive index is studied. The maximum wavelength sensitivity of this sensor is found to be 4782 nm/RIU with a high resolution of 2.09 × 10−5 RIU. The effects of different structural parameters on loss spectrum are studied in detail to optimize this SSCFF structure. In comparison to traditional PCF, this SSCFF structure is fabrication complexity free as well as a suitable candidate for developing portable devices and high refractive index analyte sensors, particularly chemical and protein sensors.

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Acknowledgments

This work is supported by Frederick University under the EM LEADERS doctoral exchange program. Specifically, Moutusi De is grateful to Dr. Kyriacos Kalli, Associate Professor at Cyprus University of Technology, Cyprus, for the valuable discussion. Authors are also thankful to Indian Institute of Technology (ISM), Dhanbad, India, for providing partial simulation facilities for this work.

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Authors and Affiliations

  1. Department of Physics, IIT (ISM) Dhanbad, Dhanbad, India

    Moutusi De & Vinod Kumar Singh

  2. Department of Electrical Engineering, Computer Engineering and Informatics, Frederick University, Nicosia, Cyprus

    Christos Markides & Christos Themistos

  3. Department of Electrical and Electronic Engineering, City University of London, London, UK

    B. M. A. Rahman

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  1. Moutusi De
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De, M., Markides, C., Singh, V.K. et al. Analysis of a Single Solid Core Flat Fiber Plasmonic Refractive Index Sensor. Plasmonics 15, 1429–1437 (2020). https://doi.org/10.1007/s11468-020-01154-2

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