Fig. 3. Polarization dependent VIS-NIR Raman responses for 30 nm gold thickness with and without annealing. (a) Raman spectra of 1 nm CoPc probed by three different laser lines (top: 532 nm, middle: 638 nm, and bottom: 785 nm) for parallel (E⃑_∥, red) and perpendicular (E⃑_⊥, blue) polarizations. (b) Difference of the imaginary parts of the pseudo-dielectric function for parallel and perpendicular excitation measured for 30 nm gold thickness without (dashed) and with annealing (solid). Difference below or above zero means that Raman is enhanced for E⃑_⊥ or E⃑_∥ polarization.