Generation of Bessel Surface Plasmon Polaritons in a Finite-Thickness Metal Film

Figure 4

2D pattern of normalized intensity distribution |𝐸^𝑙₂|²/|𝐸^𝑙₂|²_max 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 𝑧=𝜆/3.

(a)

(b)