Dr. Sunil Kumar Profile

Dr. Sunil Kumar

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Proceedings Article | 21 December 2021 Paper

Ellipse field to vector field singularities through diffraction

Baby Komal, S. Deepa, S. K. Pal, Sunil Kumar, P. Senthilkumaran

Proceedings Volume 12126, 121260J (2021) https://doi.org/10.1117/12.2615493

KEYWORDS: Diffraction, Diffraction gratings, Polarization, Superposition, Optical spheres, Physics, Singular optics

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Ellipse fields and vector fields refer to the electric fields with predominant states of polarization as elliptical and linear, respectively. Singularities in these ellipse fields (C points and L lines) and vector fields (V points) refer to points where some of the parameters related to polarization are not defined. A simple technique for transforming a C point to a V point is suggested by diffracting a higher order integral C points from a fork grating. The fork grating transfers the orbital angular momentum (OAM) in each of the diffraction orders yielding polarization singularities with different OAM and spin angular momentum (SAM) compositions. A V point singularity is obtained in one of the diffracted orders depending on the OAM content in each of the superposing circular basis of the input C point, and the charge of the fork grating. The index of the desired V point and the order in which it occurs can be engineered by appropriately choosing the input C point beam and the charge of the fork grating. Therefore, this diffraction technique can be used for the transformation of an ellipse field singularity to a vector field singularity through just a single element, i.e., a fork grating.

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