Abstract
The objective of this work is to tune the surface plasmon resonance (SPR) of thin silver and silver-copper bimetallic films into a strong and broad absorption in the red and near infrared regions for applications in Surface Enhanced Raman Spectroscopy. The SPR tuning was achieved by varying the composition of silver and copper in the films fabricated using magnetron co-sputtering method and also by annealing it under high vacuum condition. Atomic Force Microscope was used to study the film surface morphology and its growth with annealing temperatures. SPR exhibited by the films were directly studied using UV–Visible spectroscopy. Surface Enhanced Raman Scattering studies taken on Methylene Blue drop-casted on film surface shows a threefold increase in the enhancement factor of Ag–Cu films as compared to pure Ag sputtered films.
Published Version
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