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Sensing Performance of the Bragg Fiber-Based Plasmonic Sensors with Four Layers

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Abstract

We report the application of the analytical and finite element methods to the analysis of the sensing performance for the Bragg fiber-based plasmonic sensors having four layers. The advantages of an optical fiber with four (SiO2, GaP, gold, and H2O) layers are a very large value of the amplitude sensitivity (3708.8 refractive index units (RIU)−1), large values of the loss (3091.0 dB/cm) and the power fraction P (0.36) at the loss matching point for the core mode in H2O, a small value of the full width at half maximum (19.4 nm), a smaller value (2.1 nm) of the difference Δλ between maximal amplitude sensitivity and resonant wavelengths, and a symmetric line shape of the wavelength-dependent loss but a small spectral sensitivity (3236 nmRIU−1). A modification in the geometry of the fiber produces a significant change in the sensitivity and in the propagation parameters of the device. Thus, the advantages of another optical fiber with four layers are a very large value of spectral sensitivity ( nmRIU−1), large values of the amplitude sensitivity (2084.4 RIU−1), and the loss (3214.5 dB/cm) and the power fraction P (0.35), but the difference Δλ is large (8.6 nm) and the line shape for the wavelength dependence of the imaginary part of the effective index is asymmetric.

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Authors and Affiliations

  1. Department of Physics, University Politehnica of Bucharest, Bucharest, 060042, Romania

    V. A. Popescu & N. N. Puscas

  2. Department of Electronics and Telecommunications, Politecnico di Torino, C. so Duca degli Abruzzi 24, I-10129, Torino, Italy

    G. Perrone

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  1. V. A. Popescu
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  2. N. N. Puscas
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  3. G. Perrone
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Correspondence to V. A. Popescu.

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Popescu, V.A., Puscas, N.N. & Perrone, G. Sensing Performance of the Bragg Fiber-Based Plasmonic Sensors with Four Layers. Plasmonics 11, 1183–1189 (2016). https://doi.org/10.1007/s11468-015-0158-1

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  • DOI: https://doi.org/10.1007/s11468-015-0158-1

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