Figure 3: The normalized real part of the longitudinal (a) and radial (b) components of the electric vector for low-index (1) and high-index (2) TM-polarized zero-order Bessel surface plasmon polaritons versus the distance inside the gold film of 50 nm thickness embedded in SF10 glass. The distance from the Bessel surface plasmon polariton axis is , and the wavelength is .