Surface Plasmon-Modulated Fluorescence on 2D Metallic Silver Gratings

The emitting properties of fluorophores can be tailored by surface plasmon polaritons (SPPs), which offers the potential to understand the light-matter interactions at the nanoscale, and lays the groundwork for many future applications. As one of the useful features in SPPs-surface plasmon-coupled emission (SPCE) based on the metal gratings; however, the study on its underlying modulation mechanism remains far from satisfactory. That is, how it is affected by the morphology of the grating surfaces. In this letter, we have addressed this question in the dye-coated corrugated silver gratings that possess different periods and depths. It is found that the properties of SPCE are strongly dependent on the dispersion relations of SPPs modulated by the grating periods.