Fig. 4From: Polarization-Dependent Quasi-Far-Field Superfocusing Strategy of Nanoring-Based Plasmonic LensesIntensity distribution of the transverse component |E r |2 in the focal plane. The inset shows the elliptical-shape focus. The focal length is 1425 nm (a deviation of 9.62%). |E r |2 occupies 20.2% of the total electric energy. The DOF is ~1.41 λ 0 Back to article page