Figure 4
From: Plasmonic lens focused longitudinal field excitation for tip-enhanced Raman spectroscopy
Calculated and experimentally measured optical field distribution from the PL. Calculated transverse electric field (|Ex|2 + |Ey|2) magnified ten times distribution (a, b) and LEF (|Ez|2) distribution (c, d). Experimentally measured optical field distribution (e, f). Panels (a), (c), and (e) correspond to 632.8-nm incident wavelength; panels (b), (d), and (f) correspond to 532 nm-incident wavelength.