Observation of diffractive-correction and spin-orbit interaction induced effects around the Brewster angle

Abstract

We report the observation of splitting, rotation and spiraling behavior in the polarization components of the Laguerre-Gaussian beam, reflected around the Brewster angle for a TM-polarized input beam. The measurements carried out using Stokes parameters in addition show that the strength and behavior of the above-mentioned effects depend on the order of the Laguerre-Gaussian beam. These polarization effects appear to be a manifestation of the collaborative behavior of the diffraction-corrective longitudinal Goos-Hänchen and spin-orbit interaction induced transverse spin-Hall shifts, wherein the coupling between these shifts play a critical role. Except for the polarization splitting, other observed effects are absent for a TE polarized input beam. These studies are useful to understand the topological aspect of complex light field in various applications, including optical manipulation, wherein the source optical angular momentum has been point of discussion. Additionally, they can be used as a promising tool in the identification of the thickness of thin layer and optical sensing.