Abstract
In this work, a simulation study proposing a novel method for dual-sensing using surface plasmon resonance (SPR) optical fiber sensors and singlemode-multimode-singlemode (SMS) interferometer sensors was developed. The SPR theory was extended by integrating it with the MMI theory, enabling the simulation of an SPR–SMS sensor capable of sensing two parameters using a single channel. The proposed sensor structure consists of a tapered SMS with the multimode fiber cladding substituted by a gold layer for SPR excitation. The constructive parameters of the SMS structure were optimized, allowing the allocation of each effect’s resonance dip to the desired range. The proposed sensor compensates for the cross-sensitivity between two parameters, enabling the sensing of temperature and RI using a single sensor channel. The resulting transmitted spectrum yielded two dips selected for sensing, with sensitivities of 2.680 µm/RIU and \(-\) 26.26 pm/K, with \({\textrm{R}^{2}}\) = 0.9937, for the SPR dip in the 540–620 nm range. For the SMS dip near 683 nm, the resulting sensitivities are 22.61 nm/RIU and 6.302 pm/K, with \({\textrm{R}^{2}}\) = 0.9983.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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The authors declare that this work was partially supported by the Brazilian Funding Agencies (CNPq and CAPES).
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All authors contributed to the study conception and design. Material preparation and data collection were implemented by PVTdeC, the analysis was performed by all authors. The first draft of the manuscript was written by PVTdeC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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de Carvalho, P.V.T., Martinez, M.A.G. & Giraldi, M.T.R. Analysis of single-channel SPR–SMS refractive index and temperature sensor. Opt Quant Electron 55, 709 (2023). https://doi.org/10.1007/s11082-023-04963-x
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DOI: https://doi.org/10.1007/s11082-023-04963-x