Abstract
By numerically simulating the sharp focusing of fractional-order vector beams (0≤m≤1, with azimuthal polarization at m=1 and linear polarization at m=0), it is shown that the shape of the intensity distribution in the focal spot changes from elliptical (m=0) to round (m=0.5) and ends up being annular (m=1). Meanwhile, the distribution pattern of the longitudinal component of the Poynting vector (energy flux) in the focal spot changes in a different way: from circular (m=0) to elliptical (m=0.5) and ends up being annular (m=1). The size of the focal spot at full width at half maximum of intensity for a first-order azimuthally polarized optical vortex (m=1) and numerical aperture NA=0.95 is found to be 0.46 of the incident wavelength, whereas the diameter of the on-axis energy flux for linearly polarized light (m=0) is 0.45 of the wavelength. Therefore, the answers to the questions: when the focal spot is round and when elliptical, or when the focal spot is minimal -- when focusing an azimuthally polarized vortex beam or a linearly polarized non-vortex beam, depend on whether we are considering the intensity at the focus or the energy flow. In another run of numerical simulation, we investigate the effect of the deviation of the beam order from m=2 (when an energy backflow is observed at the focal spot center). The reverse energy flow is shown to occur at the focal spot center until the beam order gets equal to m=1.55.
Highlights
By numerically simulating the sharp focusing of fractional-order vector beams (0 m 1, with azimuthal polarization at m = 1 and linear polarization at m = 0), it is shown that the shape of the intensity distribution in the focal spot changes from elliptical (m = 0) to round (m = 0.5) and ends up being annular (m = 1)
In another run of numerical simulation, we investigate the effect of the deviation of the beam order from m = 2
Topological features of vector vortex beams perturbed with uniformly polarized light
Summary
Sharper focus for a radially polarized light beam. [4] Guan J, Lin J, Chen C, Ma Y, Tan J, Jin P. [7] Lin J, Chen R, Jin P, Cada M, Ma Y. Generation of longitudinally polarized optical chain by 4 focusing system. Focusing properties of cylindrical vector vortex beams. High-aperture binary axicons for the formation of the longitudinal electric field component on the optical axis for linear and circular polarizations of the illuminating beam. Focusing of high order cylindrical vector beams.
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