Results 241 to 250 of about 441,106 (295)
Some of the next articles are maybe not open access.
Tight focusing of quasi-cylindrically polarized beams
Journal of the Optical Society of America A, 2014Based on vectorial diffraction theory, tight focusing properties of quasi-cylindrical polarized beams (QCPBs) composed of equal fan-shaped sectors with linear polarization are investigated. We find that, for quasi-radially polarized illumination, a weak azimuthal component emerges and the circular symmetry of focus is traded in when the total number of
Zhongsheng, Man +3 more
openaire +2 more sources
Tight focusing of elliptically polarized vortex beams
Applied Optics, 2009We study the focusing properties of elliptically polarized vortex beams. Based on vectorial Debye theory, some numerical calculations are given to illustrate the intensity and phase distribution properties of tightly focused vortex beams. It is found that the spin angular momentum of the elliptically polarized vortex beam will convert to orbital ...
Baosuan, Chen, Jixiong, Pu
openaire +2 more sources
Tight focusing cylindrical vector beams with fractional order
Journal of the Optical Society of America B, 2021By simulating tight focusing of vector beams with azimuthal polarization of fractional order 0 < m < 1 ( m = 1 is the azimuthal polarization; m = 0 is the linear polarization), it is shown that the shape of the intensity distribution in the focal spot changes from ...
S. S. Stafeev +3 more
openaire +1 more source
Tight focusing properties of hybridly polarized vector beams
Journal of the Optical Society of America A, 2012We theoretically investigate the tight focusing properties of hybridly polarized vector beams. Some numerical results are obtained to illustrate the intensity, phase, and polarization of tightly focused hybridly polarized vector beams. It is shown that the shape of the focal pattern may change from an elliptical beam to a ring focus with increasing ...
Kelei, Hu, Ziyang, Chen, Jixiong, Pu
openaire +2 more sources
Tight focusing of an asymmetric Bessel beam
Optics Communications, 2015Abstract Tight focusing of a linearly polarized asymmetric Bessel beam, which has a topological charge n =3 and a crescent shape, was investigated numerically and experimentally. Using the Debye formulae, it was shown that the aplanatic lens of numerical aperture NA=0.9 forms a crescent in the focal plane.
Victor V. Kotlyar +2 more
openaire +1 more source
Tight focusing properties of anomalous vortex beams
Optik, 2018Abstract Tight focusing properties of an anomalous vortex beam (AVB) passing through a high numerical aperture (NA) lens system are investigated, based on vector Debye integral. The numerical examples show that intensity distribution for the AVBs in focal region depend on the beam parameters including the topological charge m , the order of the AVBs
Mingyan Zhang, Yuanjie Yang
openaire +1 more source
Tight focusing of spirally polarized vortex beams
Optics & Laser Technology, 2010The tight focusing of spirally polarized focused vortex beams is analyzed numerically based on the vectorial Debye theory. The expressions for the electric field and the orbital angular momentum of focused beams are derived. It is shown that the intensity distribution in the focal plane is dependent on the specific spirally polarized state and the ...
Jixiong Pu, Zhiming Zhang
openaire +1 more source
Tight focusing of electromagnetic fields by large-aperture mirrors
Physical Review E, 2019We derive nonparaxial input conditions for simulations of tightly focused electromagnetic fields by means of unidirectional nonparaxial vectorial propagation equations. The derivation is based on the geometrical optics transfer of the incident electric field from significantly curved reflecting surfaces such as parabolic and conical mirrors to the ...
D. E. Shipilo +6 more
openaire +3 more sources
Tight focusing of radially polarized vortex laser pulse
The European Physical Journal Applied Physics, 2013The tight focusing of femtosecond radially polarized vortex laser pulse by a high numerical aperture objective is investigated in this paper. Based on Richards-Wolf vectorial diffraction theory, the electric field and the group velocity of the radially polarized vortex femtosecond laser pulse are studied in great detail.
Lina Guo +3 more
openaire +1 more source
Tight focusing of a quasi-cylindrical optical vortex
Optics Communications, 2017Abstract In this article, we numerically investigate the tight focusing of a quasi-cylindrical optical vortex with azimuthal polarization and a wavelength of 532 nm using a Fresnel zone plate with a numerical aperture of NA = 0.95. It is shown that the focal spot produced by a beam with six sectors does not differ from the ideally azimuthally ...
S.S. Stafeev, V.V. Kotlyar
openaire +1 more source