253692.fig.004a
(a)
253692.fig.004b
(b)
Figure 4: 2D pattern of normalized intensity distribution for low- (a) and high-index (b) zero-order Bessel surface plasmon polaritons outside the gold layer of 50 nm thickness embedded in SF10 glass. BSPPs are generated by a purely radially polarized Bessel beam having a wavelength of 633 nm. The distance from the entrance surface of the metal layer is .