Figure 2From: Spectral and mode properties of surface plasmon polariton waveguides studied by near-field excitation and leakage-mode radiation measurementLeakage radiation images and intensity profiles of DLSPPW for gold-based and silver-based DLSPPWs. Leakage radiation images of SPPs on (a) gold film and (b) silver film. The bright spot is the excitation source from the fiber tip. (c) The SPP intensities as a function of distance as measured at RGB pixels in a color CCD.Back to article page