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D-shaped silicon core fiber-based surface plasmon-resonance refractive index sensor in 2 µm

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Abstract

In this paper, we propose a D-shaped silicon core fiber sensor based on surface plasmon resonance within the 2 µm range. Au layer coating on the D-shaped side-face of silicon core fiber acts as a plasmonic active metal. By using the limited element methods, the sensing properties of the proposed sensor are investigated, and an average sensitivity up to 2650 nm/RIU with a resolution of ${3.776} \times {{10}^{- 5}}\;{\rm RIU}$ is obtained for the analyte of different refractive indices varies from 1.25 to 1.6. In the investigated simulation, we used real parameters of liquid (e.g., ${{\rm CH}_4}$ liquid and ${{\rm CHBr}_3}$) in our simulations for being closer to reality. In addition, the Au coating layer and analyte are placed on the D-shaped side-face of the proposed fiber sensor; hence, this structure does not need to fill the voids. Thus, it is easy to fabricate and put to use. Also, the wavelength band in 2 µm is far from the optical communication band, which means the proposed sensor could be connected with a fiber network without any influence and crosstalk.

© 2020 Optical Society of America

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