FIG. 6: Normalized angular distribution of radiated power for a) the P polarization where the incident electric field is parallel to the analysis plane, and b) for the S polarization where the detector is scanned perpendicularly to the plane of polarization of the incident light. Experimental data are shown in circles. The thick line corresponds to the present quasi-multipole model, the thin line to the 2-dipole model. The experimental data (aperture radius a = 20 nm, light wavelength λ = 633 nm) are taken from Refs. 1,2. 21