Helicity dependent diffraction by angular momentum transfer

Deepa, S.; S, Bhargava Ram B; Senthilkumaran, P.

doi:10.1038/s41598-019-48923-6

Cited by 16 publications

(7 citation statements)

References 39 publications

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“…When diffracted through fork grating [104], a V-point segregates into C-points of one handedness in positive diffraction orders and of opposite handedness in negative diffraction orders. Helicity conservation has also been observed in diffraction scattering [105].…”

Section: V-pointsmentioning

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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Section: V-pointsmentioning

confidence: 99%

Phase Singularities to Polarization Singularities

Ruchi

Senthilkumaran

Pal

2020

International Journal of Optics

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“…The angle is related to the VHWR azimuth angle by , where denotes the fast axis direction when 20 . Therefore, using and taking , we can input OAMs wave function into as follows: where is the wave function for OAMs with the topological charge number 54 .…”

Section: Theory and Methodologymentioning

confidence: 99%

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

Deachapunya

Srisuphaphon

Buathong

2022

Sci Rep

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Higher orders of orbital angular momentum states (OAMs) of light have been produced with a double-pass configuration through a zero-order vortex half-wave retarder (VHWR). This double-pass technique can reduce the number of VHWR plates used, thus reducing costs. The OAM states of the vortex beams are identified by the near-field Talbot effect. Polarization dependence of the vortex states can also be demonstrated with this VHWR using Talbot effect. Without using the Talbot patterns, this effect of the polarization on the vortex beam can not be recognized. A theoretical validation has also been provided to complement the experimental results. Our study gives an improved understanding of this approach to use a VHWR plate.

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“…For example, a left-handed (LH) lemon can be generated due to the superposition of a non-vortex beam and a positively charged scalar vortex in LCP and RCP states, respectively. Therefore, helicity can be controlled by OAM transfer processes in spin-orbit beams [16,24]. Two polarization distributions are orthogonal if their inner product is zero, i.e.…”

Section: Helicity and Orthogonal States Of Spin-orbit Beamsmentioning

confidence: 99%

Helicity inversion and generation of orthogonal, degenerate index states of generic C points

Komal¹,

Deepa²,

Pal³

et al. 2021

J. Opt.

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We discuss a technique to invert the helicity of generic C points and generate its orthogonal state of polarization in a single step through a fork grating (FG). It is experimentally demonstrated that the beam in each of its diffraction orders possesses a degenerate C point index state. The diffraction phenomenon reported is helicity-dependent, in which left and right-handed ellipse field singularities are separated. The orthogonal polarization state of the input singularity is produced in one of the first diffracted orders of the grating. For every singularity that the grating produces, its orthogonal polarization state is also available in one of its diffraction orders. In contrast to a half-wave plate, where helicity inversion is accompanied by index inversion, a FG inverts helicity without inverting the index. Therefore, a FG can be used to perform multi-functions under generic C point illumination.

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Helicity dependent diffraction by angular momentum transfer

Cited by 16 publications

References 39 publications

Phase Singularities to Polarization Singularities

Phase Singularities to Polarization Singularities

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

Helicity inversion and generation of orthogonal, degenerate index states of generic C points

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