Figure 4
Experimental and numerical second-harmonic images corresponding to oriented NRs excited using focused linear and radial polarizations.
(a) The four angular NR orientations, (0°, 30°, 45° and 60°) are shown in (column b1-e1). The experimental SHG intensity distributions are shown for different NR orientations using focused x-polarized LP (column b2-e2) and radial polarizations (column b4-e4). The SHG intensity is always normalized to the highest intensity observed among the two polarizations, allowing a visual comparison. The experimental (green lines) and calculated (red lines) intensity profiles for the different NR orientations using both focused x-polarized LP and radial polarizations are also shown. (Column b3-e3) and b5-e5 are calculated SHG images using focused linear (x) and radial polarizations under the same experimental conditions.
