142 citations · 310 across the 17 of their papers we have counts for
18 papers
Enhanced Spin-Orbit Interaction of Light through Complex Fresnel Reflection
Dileep Kumar Upadhyay, Nirmal K. Viswanathan
Spin-orbit interaction (SOI) of light manifests as the generation of a spin-dependent vortex beam and the spin-Hall effect when a spin-polarized beam interacts with an optical inte…
Extreme Cross-polarization Extinction Method for Quantification of Residual Crystal Anisotropy
Upasana Baishya, Nirmal K Viswanathan
The high-extinction cross-polarization measurement of a paraxial laser beam results in a Hermite-Gaussian ()-like four-lobes with a dark-centered cross pattern. The…
Spin-orbit Interaction-mediated Measurement of Surface Chirality
Upasana Baishya, Nirmal K. Viswanathan
The spin-orbit interaction in a focused-reflected beam of light results in spatially non-uniform polarization in the beam cross-section due to the superposition of orthogonal field…
Experimental Measurement of Transverse Spin Dynamics in the Nonparaxial Focal Region
Nitish Kumar, Cyriac Raju, Dinesh N. Naik +1
The superposition of complex optical fields in three-dimension (3D) is the basis of several non-trivial wave phenomena. Significant among them are the non-uniform polarization dist…
Complex far fields and optical singularities due to propagation beyond tight focusing: combined effects of wavefront curvature and aperture diffraction
Nitish Kumar, Anirban Debnath, Nirmal K. Viswanathan
All optical systems, which involve the collimation of a reflected, transmitted or scattered wave subsequent to tight focusing, are subject to two kinds of deviations. One is the wa…
Measurement of Orbital Angular Momentum of Light using Stokes Parameters and Barnett's Formalism
Anirban Debnath, Nirmal K. Viswanathan
We present a formalism for experimental determination of the orbital angular momentum (OAM) of a paraxial optical beam-field by intertwining Barnett's formalism and Stokes paramete…