This paper is intended to demonstrate the effect of coupled surface plasmon polaritons (SPPs) on the optical response of a one-dimensional metal grating nanostructure patterned by electron beam lithography (EBL) on the silicon surface. Variations of the structure parameters allow continuously tuning of these high-transmission bands across the nanostructure plasmon resonance. This phenomenon gives rise to a selective spectral response and a local field enhancement which can be used in the context of nano-optics. We have examined the emission and reflectance spectra through various fabricated structure layers to determine the emissive angle in SPPs modes. The presented results show that the enhanced reflectance through grating nanostructures is important for such a planar design of novel optical biosensor.