Gold nanorings exhibit tunable near-infrared plasmon resonances, which can be adjusted by varying the ratio of ring thickness to radius. These resonances arise from coupling of dipolar modes at the inner and outer surfaces of the nanorings, leading to enhanced electric fields within the ring cavity. This property makes nanorings suitable for near-infrared surface-enhanced spectroscopy and sensing. The nanorings are fabricated using colloidal lithography, involving the deposition of polystyrene particles, gold evaporation, and ion beam etching. The resulting nanorings have radii of approximately 60 nm and wall thicknesses of about 14 nm. Experimental extinction spectra show that the SPR peak wavelength is highly sensitive to the d/a ratio, with a redshift of nearly 400 nm observed when the ratio decreases. Numerical calculations confirm this behavior and reveal that the SPR modes are due to symmetric and antisymmetric coupling between the inner and outer ring surfaces. The calculated extinction cross sections match well with experimental data, showing that the peak positions and widths are influenced by the d/a ratio. The symmetric mode is responsible for the near-infrared excitations, and its frequency depends on the d/a ratio. The nanorings can serve as resonant nanocavities for probing smaller nanostructures, with significant field enhancements observed in the ring cavity. The tunability of the plasmon resonance and the uniform field enhancement suggest potential applications in nonlinear optics and improved SERS sensitivity. The optical response of nanorings is well described by numerical simulations and simple models of charge oscillation patterns.Gold nanorings exhibit tunable near-infrared plasmon resonances, which can be adjusted by varying the ratio of ring thickness to radius. These resonances arise from coupling of dipolar modes at the inner and outer surfaces of the nanorings, leading to enhanced electric fields within the ring cavity. This property makes nanorings suitable for near-infrared surface-enhanced spectroscopy and sensing. The nanorings are fabricated using colloidal lithography, involving the deposition of polystyrene particles, gold evaporation, and ion beam etching. The resulting nanorings have radii of approximately 60 nm and wall thicknesses of about 14 nm. Experimental extinction spectra show that the SPR peak wavelength is highly sensitive to the d/a ratio, with a redshift of nearly 400 nm observed when the ratio decreases. Numerical calculations confirm this behavior and reveal that the SPR modes are due to symmetric and antisymmetric coupling between the inner and outer ring surfaces. The calculated extinction cross sections match well with experimental data, showing that the peak positions and widths are influenced by the d/a ratio. The symmetric mode is responsible for the near-infrared excitations, and its frequency depends on the d/a ratio. The nanorings can serve as resonant nanocavities for probing smaller nanostructures, with significant field enhancements observed in the ring cavity. The tunability of the plasmon resonance and the uniform field enhancement suggest potential applications in nonlinear optics and improved SERS sensitivity. The optical response of nanorings is well described by numerical simulations and simple models of charge oscillation patterns.