Phase encoding for sharper focus of the azimuthally polarized beam

Abstract

We demonstrate that a sharper focal spot area can be generated (0.147λ(2)) by using an azimuthally polarized beam propagating through a vortex 0-2π phase plate than for radial polarization (0.17λ(2)) or for linear polarization (0.26λ(2)) under the same condition. Further research illustrates that such optimistic results can still be expected when condition limitations are liberalized. This will facilitate new approaches to get superresolution in confocal systems.

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

“…32,35) Use of LG modes in a combina- tion with HG modes for particle trapping was discussed recently. 127) RP and AP high order LG vector modes have been actively studied due to their capability to generate a small focal spot, 71,73,128) which is attractive for many applications such as super-resolution microscopy or material nano-processing. Scalar LG p0 modes are of interest also due to the perspective of sharp focusing and applications in super-resolution techniques, for 3-D laser prototyping.…”

Subwavelength Gratings for Generating Azimuthally Polarized Beams

“…Based on fig. 6 we can infer that the micropolarizer not only convert linearly polarized light into azimuthally polarized beam but also add the phase shift π to diametrically opposite points of the beam [10][11][12][13][14].…”

Optical encryption in the longitudinal domain of focused fields

“…Nowadays, highly focused beams are present in numerous research areas and technical applications [1][2][3][4][5][6][7][8][9][10]. However, to the best of our knowledge no research has been reported in the field of optical security [11][12][13], using focused fields.…”