Abstract
A quasi-three-dimensional (quasi-3D) system composed of Ag nano-cubes andAg nano-hole arrays was fabricated through a low cost chemical process. Thecoupling of localized surface plasmons (LSPs) in the cube–hole array system hasbeen investigated through surface-enhanced Raman scattering (SERS) fromRhodamine 6G (R6G) molecules. A SERS enhancement factor as large as1.1 × 108 can be achieved due to this plasmonic coupling effect, and is highly sensitive to geometricalparameters, such as cube–hole array distance, hole diameter, inter-hole spacing and Ag filmthickness.
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