Fig. 3

Reflectance spectra of corresponging PdAuAg nanostructures annealed at various temperature between 400 and 900 °C tri-layers. a Reflectance spectra. b Plot of average reflectance as a funtion of annealing temperature. c Normalized reflectance spectra at 300 nm. c-1–c-2 Magnified reflectance spectra at specific locations to show the shift of dips and shoulders: boxed areas in b