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The TERS spectra obtained using radial polarization along the diagonal profile shown in figure 3B are plotted distance vs. Raman shift in panel A. The radial polarization Raman intensity profile observed at 1590 cm-1, is shown in B. Panel C shows the distance vs. Raman shift plot obtained using azimuthal polarization along the same region. The azimuthal polarization Raman intensity profile at 1590 cm-1 is shown in D.
