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Fig. 8 | Nanoscale Research Letters

Fig. 8

From: Polarization-Dependent Quasi-Far-Field Superfocusing Strategy of Nanoring-Based Plasmonic Lenses

Fig. 8

Intensity distribution of |E|2 in the case of radially polarized incident light. a, b The distribution in the focal plane and that in x-z cross section. c The intensity profile in the radial direction. d The intensity profile along the optical axis where the black solid line is the total electric field intensity distribution in simulation and the red dashed line is the calculated curve of SPP. The focal length is 1275 nm (a deviation of 1.92%). The FWHM of |E|2 and |E z |2 is 272 nm (~0.42 λ 0) and 260 nm (~0.40 λ 0), respectively. The DOF is ~1.77 λ 0

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