Elliptically squeezed axicon phase for detecting topological charge of vortex beam

Dwivedi, Rajeev; Sharma, Parag; Jaiswal, V. K.; Mehrotra, Ranjana

doi:10.1016/j.optcom.2020.126710

Cited by 18 publications

(11 citation statements)

References 34 publications

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“…From this it can be seen that the difference from the expression for the longitudinal component (6) consists only in the additional derivative with respect to the corresponding coordinate. That is, (8) must be differentiated again.…”

Section: Theoretical Calculation Of the Field In The Focal Planementioning

confidence: 89%

“…However, distortions can also have a positive effect. For example, the inclination of the incident beam, the presence of astigmatism, and the use of cylindrical lenses make it possible to visualize the topological charge of the beam [1][2][3][4][5][6] , as well as to identify the polarization state 7,8 . Using astigmatic transformations, vortex beams are formed from non-vortex fields 9,10 .…”

Section: Introductionmentioning

confidence: 99%

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Field at sharp focusing of shifted single-ring Laguerre–Gauss modes with circular polarization

Ustinov,

Khonina,

Golub

2023

Optical Technologies for Telecommunications 2022

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The report presents a theoretical and numerical analysis of the sharp focusing of a displaced Laguerre-Gauss single-ring mode with circular polarization based on the Richards-Wolf formulas. Expressions for the amplitude of the field components in the focal plane are obtained, while the case of "+"-polarization is considered in more detail. In addition to the general expression, the formula for intensity along the horizontal axis is given separately. It is more convenient for determining the displacement parameters than tracking them from the intensity pattern. Expressions are given for calculating the displacement value based on the intensity profile of the longitudinal component for large values of the vortex order. It is shown that for explicit asymmetry visualization it is advisable to use modes with a small but non-zero number.

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Section: Theoretical Calculation Of the Field In The Focal Planementioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Field at sharp focusing of shifted single-ring Laguerre–Gauss modes with circular polarization

Ustinov,

Khonina,

Golub

2023

Optical Technologies for Telecommunications 2022

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show abstract

“…When plotted, equation (5) will give rise to TC, i.e. m distinguishable spiral phase patterns often illustrated in the literature [8,[16][17][18][19]. Hence, under free space and even weak turbulence circumstances, it is possible to detect TC by applying a contour integral around these phase patterns.…”

Section: Theoretical Development and Comparison With Random Phase Scr...mentioning

confidence: 98%

Mutual coherence function based topological charge detection in a Gaussian vortex beam optical communication system

Eyyuboğlu¹

2022

Phys. Scr.

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We investigate a topological charge (TC) detection schema for an optical communication system employing Gaussian vortex beam (GVB). In this scenario, the transmitter maps the electrical message symbols to the TCs of GVBs. Thus obtained optical signal propagates in turbulent atmosphere arriving at the receiver, where a detection process is implemented to determine the TC of GVB by correlating the imaginary part of the mutual coherence function (MCF) of the incoming beam against the stored profiles. The feasibility of such a schema is firstly established by examining and comparing the analytical formulation of MCF and that of random phase screen setup. The latter is then used to explore the success rate and boundaries of this particular detection schema. Our results show that the proposed detection schema can operate with a error rate of 5 % at a link length of 5.5 km and atmospheric turbulence structure constant of 10-14.

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“…They found that EAVBs can produce spots with one more bright spots in the focal plane than the topological charge, and the bright spots at the ends have higher energy. Based on the significant characteristics of this special beam, it can be used for particle capture, [22] topological charge (TC) detection, [19,29] and optical micro-manipulation. [30] Metasurfaces are two-dimensional thin planar devices composed of arrays of subwavelength resonant units, [31][32][33][34][35][36] which are an extension and expansion of metamaterials re-search.…”

Section: Introductionmentioning

confidence: 99%

Generation of elliptical airy vortex beams based on all-dielectric metasurface

Xue

et al. 2023

Chinese Phys. B

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Elliptical Airy vortex beams (EAVBs) can spontaneously form easily identifiable topological charge focal spots. They are used for topological charge detection of vortex beams because they have the abruptly autofocusing properties of circular Airy vortex beams and exhibit unique propagation characteristics. In this paper, we study the use of the dynamic phase and Pancharatnam-Berry phase principles for the generation and modulation of EAVBs by designing complex-amplitude metasurface and phase-only metasurface, respectively, at an operating wavelength of 1500 nm. It is found that the focusing pattern of EAVBs in the autofocusing plane splits into |m|+1 tilted bright spots from the original ring, and the tilted direction is related to the sign of the topological charge number m. Due to the advantages of ultra-thin, ultra-light, and small size of the metasurface, our designed metasurface device has potential applications in improving the channel capacity based on orbital angular momentum communication, information coding, and particle capture compared to spatial light modulation systems that generate EAVBs.

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Elliptically squeezed axicon phase for detecting topological charge of vortex beam

Cited by 18 publications

References 34 publications

Field at sharp focusing of shifted single-ring Laguerre–Gauss modes with circular polarization

Field at sharp focusing of shifted single-ring Laguerre–Gauss modes with circular polarization

Mutual coherence function based topological charge detection in a Gaussian vortex beam optical communication system

Generation of elliptical airy vortex beams based on all-dielectric metasurface

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