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Tunable and sensitive graphene-plasmonic opto-fluidic nano sensor

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Abstract

In this work, five different nano-structures based on graphene-plasmonic combinations are proposed and simulated. The structures are mainly consisted of rows of cylindrical Al2O3 rods which are combined with layers of graphene, Au and TiO2. SiO2 substrate is considered for the proposed structures. In order to improve the absorption peak’s value, hollow cylindrical shaped graphene and Au layers are covered around the rods. Graphene and Au layers improve the absorption peak’s value by enhancing the confinement of the incident light wave. In order to extremely enhance the absorption peak’s value, effects of the chemical potentials (µc1, µc2) and structural parameter (b) on the absorption peak’s value are considered. Finally, the unity absorption peak’s value is obtained for the structure with two rows of cylindrical Al2O3 rods which are covered with graphene hollow cylindrical layers. The final proposed structure is considered as a refractive index opto-fluidic sensor for detection of (CH3OH (Methanol) = 1.3221, C2H5OH (Ethanol) = 1.3571, C3H7OH (Propanol) = 1.3711, C4H9OH (Butanol) = 1.3897 and C5H11OH (Pentanol) = 1.4013) with reasonable sensitivity factor of 545 nm/RIU.

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Authors and Affiliations

  1. Department of Electronic Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

    Ali Vajdi, Mojtaba Sadeghi & Zahra Adelpour

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  1. Ali Vajdi
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  2. Mojtaba Sadeghi
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  3. Zahra Adelpour
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Correspondence to Mojtaba Sadeghi.

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Vajdi, A., Sadeghi, M. & Adelpour, Z. Tunable and sensitive graphene-plasmonic opto-fluidic nano sensor. Opt Quant Electron 54, 188 (2022). https://doi.org/10.1007/s11082-022-03543-9

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