# Vectorial vortex generation and phase singularities upon Brewster reflection

## TL;DR

This paper experimentally demonstrates that Brewster reflection of focused circularly polarized light from a dielectric substrate produces a purely azimuthally polarized vectorial vortex beam with phase singularities, revealing new possibilities for light manipulation.

## Contribution

It introduces a novel phenomenon where Brewster reflection induces vectorial vortex beams with phase singularities, expanding understanding of polarization effects in optics.

## Key findings

- Generation of azimuthally polarized vortex beams at Brewster's angle
- Local phase singularities in reflected field components
- Potential applications in polarization microscopy and exotic light states

## Abstract

We experimentally demonstrate the emergence of a purely azimuthally polarized vectorial vortex beam with a phase singularity upon Brewster reflection of focused circularly polarized light from a dielectric substrate. The effect originates from the polarizing properties of the Fresnel reflection coefficients described in Brewster's law. An astonishing consequence of this effect is that the reflected field's Cartesian components acquire local phase singularities at Brewster's angle. Our observations are crucial for polarization microscopy and open new avenues for the generation of exotic states of light based on spin-to-orbit coupling, without the need for sophisticated optical elements.