Energy circulations in singular beams diffracted through an isosceles right triangular aperture

Bahl, Monika; Senthilkumaran, P.

doi:10.1103/physreva.92.013831

Cited by 14 publications

(6 citation statements)

References 30 publications

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“…Since Hickmann et al 40 unveiled in 2010 the exotic lattice pattern in triangular-aperture far-field diffraction of VBs, it has been used as an effective method for OAM detection and measurement of femtosecond vortices 113 , non-integer charge vortices 114 , and elliptical VBs 115 . Many other unique far-field diffraction patterns were investigated through a slit 116 , a square aperture 117 , a diamond-shaped aperture 118 , a circular aperture 119 , an off-axis circular aperture 120 , an isosceles right triangular aperture 121 , a sectorial screen 122 , and so on. The Fresnel diffraction of VBs was also studied 123 .…”

Section: Properties Of Ovsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities bearing some analogy with the superfluid vortex. Since then, optical vortices have been widely studied, inspired by the hydrodynamics sharing similar mathematics. Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum optics. These amazing properties provide a new understanding of a wide range of optical and physical phenomena, including twisting photons, spin–orbital interactions, Bose–Einstein condensates, etc., while the associated technologies for manipulating optical vortices have become increasingly tunable and flexible. Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum entanglement, and nonlinear optics. This article reviews the recent progress in tunable vortex technologies along with their advanced applications.

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Section: Properties Of Ovsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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“…Multiple slits correspond to grating, and special gratings were also designed [263,321,342] for the diffraction study. Apertures of different shapes ranging from triangular [81,343], circular [344,345], diamond-shaped [161], hexagonal [346], regular polygon [347], and annular [151,155,348,349] were also used in diffraction experiments. Additional methods for vortex charge determination based on using twisted phase element [350], hyperbolic grating [351], axicon [352], spiral spectra [353], single point detector [354], and Talbot effect [355] were also reported in literature.…”

Section: Literature Survey Of Phase and Polarization Singularitiesmentioning

confidence: 99%

Phase Singularities to Polarization Singularities

Ruchi

Senthilkumaran

Pal

2020

International Journal of Optics

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Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating ϕ12 Stokes phase gradients are present. At the phase and polarization singularities, undefined quantities are the phase and ϕ12 Stokes phase, respectively. Conversion of circulating phase gradient into circulating Stokes phase gradient reveals the connection between phase (scalar) and polarization (vector) singularities. We demonstrate this by theoretically and experimentally generating polarization singularities using phase singularities. Furthermore, the relation between scalar fields and Stokes fields and the singularities in each of them is discussed. This paper is written as a tutorial-cum-review-type article keeping in mind the beginners and researchers in other areas, yet many of the concepts are given novel explanations by adopting different approaches from the available literature on this subject.

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“…The vortex wave can easily interfere with the plane wave, spherical wave, or conjugate light wave. [15,16] Moreover, the diffraction or interference intensity modes can be obtained by using various diffractive apertures, [17][18][19][20][21] slits, or pinholes. [22][23][24][25][26][27][28] Recently, the multipoint interferometer (IMI) for measuring the OAM of an optical vortex with high topological charge [29] and digital micromirror device for probing the OAM of Laguerre-Gaussian (LG) beams [30] were also proposed.…”

Section: Introductionmentioning

confidence: 99%

Settled fast measurement of topological charge by direct extraction of plane wave from vortex beam*

Yang

2021

Chinese Phys. B

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A method of measuring the vortex beam topological charge (TC) is proposed based on a device that can directly extract the plane wave form from the vortex beam in which the different propagation angles of the plane waves are uniquely related to the different TCs. Then the TC can be obtained by simply comparing the energy values perceived by two fixed sensors in the detection location with the help of twin omnidirectional energy absorbers (OEAs). Because the settled detection relies only on the simple quantitative value at two fixed positions, neither pattern recognition nor field analysis procedure is applied, thus allowing faster measurement. Some features of the methodology are investigated, and the numerical simulations verify the feasibility and robustness of the system.

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Energy circulations in singular beams diffracted through an isosceles right triangular aperture

Cited by 14 publications

References 30 publications

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Phase Singularities to Polarization Singularities

Settled fast measurement of topological charge by direct extraction of plane wave from vortex beam*

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