Kapil kumar Gangwar

• M.Tech.
• Research scholar at Indian Institute of Technology Delhi

In this paper, a novel methodology for generating polarization singularity lattices using ramp phase structures in a polarization interferometer is presented. By applying differential tilts to distinct regions within the wavefront using a spatial light modulator, a phase-discontinuity line separating the two regions is formed. During propagation al...

An approach for generating Stokes singularity lattices utilizing a phase ramp structure within a polarization interferometer is presented here. Simulated results are presented to elucidate and illustrate the proposed concept.

In this paper, we propose a method for the generation of a two-dimensional spin-orbit beam lattice using a Dammann grating. A Dammann grating is fabricated and is illuminated by ellipse field/vector filed singular beam that contains a polarization singularity. Since, Dammann grating is used to produce equal-intensity light spots, each of the spin-o...

A method of generation of polarization singularity lattice is presented. Singularities are produced at discrete points along the line of phase discontinuity by giving different circular phase ramp in different regions of wavefront.

Dammann gratings conceived earlier are designed using iterative procedures to produce equal intensity light spots. In this paper, we show a novel method to design a Dammann grating by solving optimization problem. We solve the optimization problem by a grid search method with resolution determined by fabrication capabilities. The grid-search method...

Structured optical lattices obtained from interference of three linearly polarized plane waves arranged in a cone geometry produce interlaced polarization singularity structures. These lattices are known to be populated with both C-point and V-point singularities. All the lattice fields abide by the principle of index conservation. In this article,...

The random intensity distribution observed due to the propagation of a coherent beam of light through a scattering medium is known as a speckle pattern. The interaction of speckles with a birefringent crystal, here, YVO4 results in the splitting of the speckles into e-ray and o-ray speckles. It is observed that the e-ray and o-ray speckles experien...