Results 251 to 260 of about 441,106 (295)
Some of the next articles are maybe not open access.
Tight focusing of high-order polarized anomalous vortex beam
Laser Physics, 2022Abstract Based on the vector Debye theory, the tight focusing properties of a high-order polarized anomalous vortex (HPAV) beam are studied. The corresponding mathematical expressions of the HPAV beam are derived theoretically. We accomplish the inner and outer gear shapes of the focusing intensity where the number of the gear tooth ...
Menghua Xu +3 more
openaire +1 more source
Short pulse propagation in tight focusing conditions
Optics Communications, 2001Abstract We report short pulse propagation simulation data generated by 3 D +1 (x,y,z,t) code which takes into account space–time Laplacian, up to cubic term dispersion, delayed Kerr non-linearity, optical shock term and multi-photon ionization.
openaire +1 more source
Tight focusing of axially symmetric polarized vortex beams
Chinese Physics B, 2014Tight focusing of axially symmetric polarized vortex beams is studied numerically based on vector diffraction theory. The mathematical expressions for the focused fields are derived. Simulation results show that the focused fields and phase distributions at focus are largely influenced by both the polarization order and topological charge of the ...
Zhe-Hai Zhou +2 more
openaire +1 more source
Tight focusing of a nonhomogeneously polarized optical vortex
Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV, 2018In this work, we fabricated and studied the performance of a 100×100-μm four-sector binary subwavelength grating polarizer in a golden film. It was experimentally demonstrated that a linearly polarized 532-nm Gaussian beam reflected at the polarizer was converted to an azimuthally polarized beam.
Liam O'Faolain +4 more
openaire +1 more source
Superfilamentation in water with tight focusing laser beams
CLEO: 2015, 2015We report whole life cycle of superfilament excited in tight focusing beams in water. Extreme energy delivery achieved under superfilamention is reflected in strong post-effects (cavitation bubbles and shock waves), which can completely characterize superfilament.
Fedor V. Potemkin +3 more
openaire +1 more source
Tight focusing of higher orders Laguerre-Gaussian modes
AIP Conference Proceedings, 2016The spatial redistribution of the contribution of different electric field components provides a decrease in the size of the central focal spot for higher orders Laguerre-Gaussian modes. It was shown that when sharply focusing laser beams with vortex or special binary phase plate, a sub-wavelength light localization of separate vector field components ...
Dmitry A. Savelyev +2 more
openaire +1 more source
Tight focusing of partially coherent and circularly polarized vortex beams
Journal of the Optical Society of America A, 2009Based on the vectorial Debye theory, the tight focusing properties of partially coherent and circularly polarized vortex beams are investigated. The focused characteristics of right-circular and left-circular polarized partially coherent vortex beams in the focal region are presented and compared by some numerical calculation results.
Baosuan, Chen +2 more
openaire +2 more sources
Tight focusing properties of a circular partially coherent Gaussian beam
Journal of the Optical Society of America A, 2018Tight focusing properties of a circular partially coherent Gaussian (CPCG) beam with linear polarization have been studied based on vectorial Debye theory. Expressions for the intensity distribution and degree of coherence near the focus are derived. Numerical calculations are performed to show the intensity distribution and degree of coherence of the ...
Huichuan Lin +5 more
openaire +2 more sources
Tight focusing of a double-ring-shaped, azimuthally polarized beam
Optics Letters, 2011We study the focusing properties of a double-ring-shaped azimuthally polarized beam through an annular high NA objective lens. It is shown that a subwavelength focal hole (∼0.5λ) with a quite long depth of focus (∼26λ) is achieved near the focus. This kind of nondiffracting focal hole is called dark channel, which may have applications in atom optical ...
Bo, Tian, Jixiong, Pu
openaire +2 more sources
Tight focusing of vortex beams in presence of primary astigmatism
Journal of the Optical Society of America A, 2009The tight focusing of vortex carrying beams is studied using the Debye-Wolf diffraction integral in the presence of primary astigmatism. The roles of topological charge, polarization distribution of the input beam, and handedness of the beam polarization are investigated in the intensity distribution of the focal plane of a high-numerical-aperture lens.
Rakesh Kumar, Singh +2 more
openaire +2 more sources