Fig. 1. (694 KB) Movie showing the intensity distribution in the x-z meridional plane due to a strongly confined radially polarized Bessel-Gauss beam. The beam is focused (NA=1.4) through an interface separating media n ₁=1.518 and n ₂=1.0. The black broken line represents the position of the interface. The color scale is a logarithmic base 10 scale.

Fig. 2. FWHM of the lateral intensity distribution at the location of axial maximum for different interface positions (n ₁=1.518,n ₂=1.0,NA=1.4). The red and magenta triangles correspond to FWHM values for x-polarized incident light along the x and y-axes, respectively. Blue stars and green squares correspond to the FWHM values of the total intensity and the longitudinal component, respectively, for radially polarized incident light.

Fig. 3. Intensity distribution for a focused radially polarized Bessel-Gauss beam (n ₁=1.518,n ₂=1.0,NA=1.4), where only 20 points were used for the numerical integration in (a) |E_x |²+|E_y |² and (b) |E_z |², and 1000 points in (c) |E_x |²+|E_y |² and (d) |E_z |², respectively.