Surface plasmon absorption topograph in a multi-layer Ti/Ag thin film by an optical beam scanning

Surface plasmon polariton absorption was visualized over a large area of Ti/Ag thin film to observe the distribution of electron density. A converging light was incident on the surface at the angle of maximum absorption or some angles a little apart from it. The reflectance of the light showed up such an image as only the electron density distribution was in high contrast or the thickness variation of the film was enhanced. The calculation gave the qualitative verification of such imaging characteristics.