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Metallic Grating-Assisted Fiber Optic SPR Sensor with Extreme Sensitivity in IR Region

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Abstract

We theoretically propose a surface plasmon resonance (SPR)-based fiber optic refractive index (RI) sensor. A surface plasmon exciting metallic grating formed with the alternation of indium tin oxide (ITO) and silver (Ag) stripes is considered on the core of the fiber. A thin film of silicon is used as an overlay. Silicon film not only protects the metallic grating from oxidation but also enhances the field to improve the device sensitivity. The sensor is characterized in terms of sensitivity, detection accuracy (DA), figure of merit (FoM), and quality factor (QF). The maximum sensitivity in the RI range 1.33 to 1.38 refractive index unit (RIU) is reported to be ~25 µm/RIU in infra-red region of investigation.

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Acknowledgements

One of the authors, Akhilesh Kumar Mishra, thanks Faculty Initiation Grant (FIG) provided by Indian Institute of Technology Roorkee, India.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Laval, Quebec City, QC, G1J 1J7, Canada

    Satyendra K. Mishra

  2. Andrew and Erna Viterby, Faculty of Electrical Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel

    Durgesh C. Tripathi

  3. Department of Physics, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Akhilesh K. Mishra

Authors
  1. Satyendra K. Mishra
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  2. Durgesh C. Tripathi
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  3. Akhilesh K. Mishra
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Correspondence to Akhilesh K. Mishra.

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Mishra, S.K., Tripathi, D.C. & Mishra, A.K. Metallic Grating-Assisted Fiber Optic SPR Sensor with Extreme Sensitivity in IR Region. Plasmonics 17, 575–579 (2022). https://doi.org/10.1007/s11468-021-01549-9

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