This work demonstrates a method to enhance the Raman signal from surfaces and thin films while suppressing interfering signals from the underlying bulk material using a transferable porous gold membrane (PAuM). JCMwave's finite element solver JCMsuite was used to numerically simulate the near-field enhancement and scattering properties of the plasmonic slot antennas within the PAuM. These simulations, analyzing nanostructures like a 10 nm x 68 nm slot, were crucial for understanding the enhancement mechanism and predicting the exponential decay of the Raman signal with distance from the surface.
R. M. Wyss, et al. Bulk-suppressed and surface-sensitive Raman scattering by transferable plasmonic membranes with irregular slot-shaped nanopores. Nat. Commun., 15, 5236 (2024).