title: Strengthening the longitudinal component of the sharply focused electric field by means of higher-order laser beams.
abstract: We study the sharp focusing of differently polarized low-order and high-order beams, including Bessel and Laguerre-Gaussian (LG) modes, to compare them using several criteria: the size of a light spot, the intensity ratio of the central peak and sidelobes, and the intensity of the longitudinal electric field component. The experiments performed using the near-field microscopy techniques are in general agreement with the results of the numerical simulation. We have validated the growth of the longitudinal component in the focus for high-order modes at moderate NA=0.6-0.8, and essential lower sidelobes of Bessel modes, in comparison with LG modes.
authors.affiliation: Image Processing Systems Institute of the Russian Academy of Sciences (RAS), Samara, Russia. khonina@smr.ru
authors.forename: S N
authors.initials: SN
authors.lastname: Khonina
authors.forename: S V
authors.initials: SV
authors.lastname: Alferov
authors.forename: S V
authors.initials: SV
authors.lastname: Karpeev