In this paper, a dual-core microchannel-based fiber sensor is studied by using finite element method in the visible and near-infrared bands. Plasmonic material gold (Au) deposited microchannel to generate surface plasmon resonance (SPR) effect, so that can detect change RI of its surrounding analyte. Simulation results show maximum wavelength sensitivity resolution are 33600 nm/RIU 2.97 × 10−6R...