Optical enhancements on gold thin films through surface nanostructure modulation

Surface plasmons (SPs) on gold thin film coupling with the grating on the surface were studied. For films with periodic nanostructures, experimental results and simulations showed that the incident light was reflected as well as excited. Because the propagating wave is particular about the surface plasmons excitation, we used the FDTD simulations to predict the grating conditions such as the thickness, period, width, and depth. Optical transmission intensity enhancements due to the nanostructures on the gold thin films were observed in our results.