A graphene-based wide-angle surface plasmon resonance titanium solar thermal absorber using Fe-Fe₂O₃ materials is proposed. The design consists of three-layer constructions: titanium (Ti) in three cylinder-shaped resonators, iron (Fe) for the substrate layer, and ferric oxide (Fe₂O₃) in the ground layer. The design efficiently absorbs solar heat and converts it into thermal energy for industrial heaters. The absorber can evaluate absorption percentages in four regions: ultraviolet (UV), violet (V), near-infrared (NIR), and mid-infrared (MIR). The best four wavelengths (1.3, 1.5, 2, and 2.5 μm) show distinct absorption levels. The solar absorption rate for a 2800 nm bandwidth (0.2–3 μm) is 90.25%, and for 1800 nm and 1000 nm bandwidths, it is 96.97% and 97.84%, respectively. The design can improve solar absorption rates step by step and analyze parameter changes. The polarization section (TE and TM) from 0 to 60 degrees, electric field amount in color expression, and a comparison table are also studied. The design uses COMSOL software and the finite element method (FEM) to extract numerical data. The Ti resonator has a refractive index of 2.6112, Fe of 2.565, and Fe₂O₃ of 1.202. The design dimensions are 340 nm for the ground layer, 260 nm for the substrate, and 250 nm for the resonator. The width is 400 nm, and the cylinder radius is 100 nm. The design includes a graphene layer between the Ti resonator and Fe substrate to enhance absorption. The design is effective in absorbing solar energy and converting it into thermal energy for industrial applications.A graphene-based wide-angle surface plasmon resonance titanium solar thermal absorber using Fe-Fe₂O₃ materials is proposed. The design consists of three-layer constructions: titanium (Ti) in three cylinder-shaped resonators, iron (Fe) for the substrate layer, and ferric oxide (Fe₂O₃) in the ground layer. The design efficiently absorbs solar heat and converts it into thermal energy for industrial heaters. The absorber can evaluate absorption percentages in four regions: ultraviolet (UV), violet (V), near-infrared (NIR), and mid-infrared (MIR). The best four wavelengths (1.3, 1.5, 2, and 2.5 μm) show distinct absorption levels. The solar absorption rate for a 2800 nm bandwidth (0.2–3 μm) is 90.25%, and for 1800 nm and 1000 nm bandwidths, it is 96.97% and 97.84%, respectively. The design can improve solar absorption rates step by step and analyze parameter changes. The polarization section (TE and TM) from 0 to 60 degrees, electric field amount in color expression, and a comparison table are also studied. The design uses COMSOL software and the finite element method (FEM) to extract numerical data. The Ti resonator has a refractive index of 2.6112, Fe of 2.565, and Fe₂O₃ of 1.202. The design dimensions are 340 nm for the ground layer, 260 nm for the substrate, and 250 nm for the resonator. The width is 400 nm, and the cylinder radius is 100 nm. The design includes a graphene layer between the Ti resonator and Fe substrate to enhance absorption. The design is effective in absorbing solar energy and converting it into thermal energy for industrial applications.