Evolution of bimeronic beams using Gaussian optics

Abstract

In optics, a bimeronic beam can be generated by superposing a two Laguerre-Gaussian modes with horizontal and vertical polarization state. In this paper, we studied the evolution of bimeronic beams by manipulating the parameters of a Gaussian beam using a lens. We used the ABCD matrix formalism to calculate the new beam parameters and we analyzed the change in polarization distribution from the focus to the Rayleigh range. The polarization distribution was calculated using the Stokes parameters. We have found that bimeronic beams evolve from a Néel type bimeron at the focus to a Bloch type at the Rayleigh length.