Tight-focusing properties of linearly polarized circular Airy Gaussian vortex beam

2020 ◽  
Vol 45 (2) ◽  
pp. 296 ◽  
Author(s):  
Jingli Zhuang ◽  
Liping Zhang ◽  
Dongmei Deng
Keyword(s):  
Vortex Beam ◽  
Tight Focusing ◽  
Linearly Polarized ◽  
Focusing Properties

Tight focusing properties of linearly polarized Gaussian beam with a pair of vortices

2011 ◽  
Vol 375 (32) ◽  
pp. 2958-2963 ◽  
Author(s):  
Ziyang Chen ◽  
Jixiong Pu ◽  
Daomu Zhao
Keyword(s):  
Gaussian Beam ◽  
Tight Focusing ◽  
Linearly Polarized ◽  
Focusing Properties

Tight focusing properties of spatial-variant linearly-polarized vector beams

2013 ◽  
Vol 43 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Bing Gu ◽  
Yang Pan ◽  
Jia-Lu Wu ◽  
Yiping Cui
Keyword(s):  
Tight Focusing ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Focusing Properties

Tight focusing properties of phase modulated azimuthally polarized doughnut Gaussian vortex beam by high NA parabolic mirror

2020 ◽  
Vol 26 ◽  
pp. 3539-3543
Author(s):  
N. Umamageswari ◽  
M. Lavanya ◽  
M. Udhayakumar ◽  
K.B. Rajesh ◽  
Z. Zaroszewicz
Keyword(s):  
Vortex Beam ◽  
Parabolic Mirror ◽  
Tight Focusing ◽  
High Na Parabolic Mirror ◽  
Focusing Properties

scholarly journals Tight focusing properties and focal field tailoring of cylindrical vector beams generated from a linearly polarized coherent beam array

2021 ◽  
Vol 29 (4) ◽  
pp. 5259
Author(s):  
Yuqiu Zhang ◽  
Tianyue Hou ◽  
Hongxiang Chang ◽  
Tao Yu ◽  
Qi Chang ◽  
...  
Keyword(s):  
Coherent Beam ◽  
Beam Array ◽  
Tight Focusing ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Focusing Properties

scholarly journals Focusing fractional-order cylindrical vector beams

2021 ◽  
Vol 45 (2) ◽  
pp. 172-178
Author(s):  
S.S. Stafeev ◽  
V.D. Zaitsev
Keyword(s):  
Fractional Order ◽  
Energy Flux ◽  
Energy Flow ◽  
Focal Spot ◽  
Numerical Aperture ◽  
Vortex Beam ◽  
Incident Wavelength ◽  
Spot Center ◽  
Vector Beams ◽  
Linearly Polarized

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.

scholarly journals Longitudinal Component Properties of Circularly Polarized Terahertz Vortex Beams

2021 ◽  
Vol 9 ◽  
Author(s):  
Miao Wang ◽  
Xinke Wang ◽  
Peng Han ◽  
Wenfeng Sun ◽  
Shengfei Feng ◽  
...  
Keyword(s):  
Spot Size ◽  
Longitudinal Component ◽  
Transverse Component ◽  
Quarter Wave Plate ◽  
Phase Plate ◽  
Vortex Beam ◽  
Circularly Polarized ◽  
Left Hand ◽  
Quarter Wave ◽  
Focusing Properties

A circularly polarized vortex beam possesses similar focusing properties as a radially polarized beam. This type of beam is highly valuable for developing optical manufacturing technology, microscopy, and particle manipulation. In this work, a left-hand circularly polarized terahertz (THz) vortex beam (CPTVB) is generated by utilizing a THz quarter wave plate and a spiral phase plate. Focusing properties of its longitudinal component Ez are detailedly discussed on the simulation and experiment. With reducing the F-number of the THz beam and comparing with a transverse component Ex of a general circularly polarized THz beam, the simulation results show that the focal spot size and intensity of its Ez component can reach 87 and 50% of Ex under a same focusing condition. In addition, the experimental results still demonstrate that the left-hand CPTVB can always maintain fine Ez focusing properties in a broad bandwidth, which manifest the feasibility of this class of THz beams.

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