Surface Plasmon Resonance and Interference Coenhanced SERS Substrate of AAO/Al-Based Ag Nanostructure Arrays

Abstract

Surface-enhanced Raman scattering (SERS) substrate of Ag nanostructure arrays patterned by porous anodic aluminum oxide (AAO) membrane supported on Al substrate (AAO/Al) were fabricated by electron beam evaporation technique. By introducing Al substrate, the optical and SERS properties of as-prepared AAO/Al-based Ag nanostructure arrays are much different from those of the AAO-based array. By optimizing the thickness of both deposited Ag and AAO membrane, the SERS enhancement factor (EF) of as-fabricated AAO/Al-based Ag nanostructure arrays reached 9.77 × 10 7 due to the SPR and destructive interference coenhanced effects, which is higher than that of AAO-based Ag nanostructure arrays. Also, the mechanism of SPR and destructive interference coenhanced local EM fields as well as SERS enhancement were demonstrated by FDTD simulation results.