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(a) Cross sectional schematic of the PC-SERS substrate, (b) cross sectional SEM image of post-cap nanostructures, and top-view SEM images of (c) PC-SERS and (d) GL-SERS substrates.
Simulation models for (a) GL-SERS and (b) PC-SERS substrates and plane cross sectional simulated electric-field distribution for a single Ag nanostructure on (c) GL-SERS and PC-SERS substrates at (d) off- and (e) on-resonance conditions.
(a) Comparison of Raman spectra of BPE on GL-SERS and PC-SERS substrates at on/off resonance conditions and (right top) log-log plot of the Raman signal from GL-SERS and PC-SERS substrates against the estimated number of excited BPE molecules. (b) Comparison of measured Raman signal and simulated for varying incident angles.
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