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

Zhuang, Jingli; Zhang, Liping

doi:10.1364/ol.45.000296

Cited by 74 publications

(26 citation statements)

References 22 publications

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“…This implies that in the present focused field the spiral structure of SD vectors can exist in a wider region, a 2D space, rather than only along one fixed direction, i.e. the 1D propagation axis in previous studies [19]- [22], [25], [26]. Furthermore, the present 3D field is constructed without optical vortex, and this also indicates that although the spiral structure of SD vectors can be a result of SOIs [19]- [21], [37], the OAM is not a necessary condition for this special structure (despite the fact that the OAM were used in all previous studies).…”

Section: B Sd Vector Twistsmentioning

confidence: 77%

“…the spiral twists of SD vectors can be constructed in 3D space [19]. Since the spiral twists of SD vectors can provide a new rotational degree of freedom in 3D optical manipulation, a number of 3D vector fields have been proposed for generating the spiral twists of SD vectors [20]- [22], [25], [26]. However, there may exist two problems in these reported researches.…”

Section: Introductionmentioning

confidence: 99%

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Constructing Spin Density Vector Twists With Spin Density Singularity

Pang

Zhang

et al. 2022

IEEE Photonics J.

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In this article, we propose a non-orbital angular momentum (OAM) method for constructing the spiral twists of spin density (SD) vectors in three-dimensional (3D) optical fields. This is realized by generating strings of SD singularities in a longitudinal plane of a strongly focused HG10 mode beam with circular polarization. We demonstrate that in this plane, the SD singularities manifest themselves as the Gouy phase difference. Through observing the Gouy phase difference, the strings of the SD singularities and their topological reactions are examined. It is found that the spiral twists of SD vectors are constructed in the two-dimensional (2D) space between two strings and their twisting behaviors can be adjusted by the topological reactions of the strings. This finding shows that the spiral twists can be formed in a 2D space rather than the 1D space in previous studies, which provides a more flexible way to utilize this rotational degree of freedom. Our result also clarifies that although the spiral twists of SD vectors can be a result of spin-orbital angular momentum interaction, the OAM is not a necessary condition for the generation of these twists. Our theoretical proposal for structuring SD vectors may have applications in 3D optical manipulation.

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Section: B Sd Vector Twistsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Constructing Spin Density Vector Twists With Spin Density Singularity

Pang

Zhang

et al. 2022

IEEE Photonics J.

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“…The auto-focusing has also been investigated in multiple variants such as radially polarised circular Airy beam [36], vortex circular Airy beam(CAB) [37,38], circular arrayed CAB [39], chirped CAB [40], tightly focused CAB [41,42], partially coherent CAB [43] and ring Airy Gaussian beam (RAiG) [44]. As mentioned ALBs possess several special characteristics, but so far, a controlled transfer of intensity from one region to another in ALBs have not been explored.…”

Section: Introductionmentioning

confidence: 99%

Generating asymmetric aberration laser beams with controlled intensity distribution

Singh,

Dev,

Pal

2022

Preprint

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We present generation of asymmetric aberration laser beams (aALBs) with controlled intensity distribution, using a diffractive optical element (DOE) involving phase asymmetry. The asymmetry in the phase distribution is introduced by shifting the coordinates in a complex plane. The results show that auto-focusing properties of aALBs remain invariant with respect to the asymmetry parameters. However, a controlled variation in the phase asymmetry allows to control the spatial intensity distribution of aALBs. In an ideal ALB containing equal intensity three bright lobes (for m = 3), by introducing asymmetry most of the intensity can be transferred to any one of single bright lobe, and forms a high-power density lobe. A precise spatial position of high-power density lobe can be controlled by the asymmetry parameter β and m, and we have determined the empirical relations for them. We have found that for the specific values of β, the intensity in the high-power density lobe can be enhanced by ∼6 times the intensity in other bright lobes. The experimental results show a good agreement with the numerical simulations. The findings can be suitable for applications such as in optical trapping and manipulation as well as material processing.

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“…The first work in which a subwavelength focal spot was experimentally obtained using radially polarized light was carried out in 2003 [ 6 ]. By carefully selecting the polarization of the focused light, it is possible to create compact focal spots [ 6 , 7 ], optical needles [ 8 , 9 , 10 , 11 ], light tunnels [ 12 , 13 ], optical chains [ 14 , 15 , 16 , 17 ], foci with a flat apex [ 18 , 19 , 20 ], lattice-like optical structures [ 21 ], magnetization spots and chains [ 22 , 23 , 24 , 25 ], polarization knots [ 26 ], Möbius strips [ 27 ], and the Hilbert hotel phenomenon [ 28 ], among other effects.…”

Section: Introductionmentioning

confidence: 99%

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

Kotlyar

Stafeev

Zaitsev

2021

Sensors

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It is shown, theoretically and numerically, that the distributions of the longitudinal energy flow for tightly focused light with circular and linear polarization are the same, and that the spot has circular symmetry. It is also shown that the longitudinal energy flows are equal for optical vortices with unit topological charge and with radial or azimuthal polarization. The focal spot has a minimum diameter (all other characteristics being equal), which is measured based on the intensity of an optical vortex with azimuthal polarization. The diameter of the focal spot calculated from the energy flow for light with circular or linear polarization is slightly larger (by a fraction of a percentage). The magnitude of the diameter based on the intensity plays a role in the interaction of light with matter, and the magnitude of the diameter based on the energy flux affects the resolution in optical microscopy which is crucial in sensorial applications.

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

Cited by 74 publications

References 22 publications

Constructing Spin Density Vector Twists With Spin Density Singularity

Constructing Spin Density Vector Twists With Spin Density Singularity

Generating asymmetric aberration laser beams with controlled intensity distribution

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

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