Difração da luz com momento angular orbital entre as aberturas quadrada e triangular: um estudo comparativo

Abstract

In this dissertation, we show experimentally and theoretical using the Fraunhofer diffraction of light beams with Laguerre-Gaussian (LG) possessing orbital angular momentum (OAM) a comparative study of the diffraction pattern of square and triangular apertures. We demonstrate that it is possible to engineer a square optical lattices for high values of MAO, about two times bigger than it would be with the triangular apertures. We observed that the pattern of square aperture remains truncated to the topological charge (TC) equal 20 with a good precision. On the other hand, for triangular aperture, we observe that the optical lattices ramains truncated until TC equal to 10. However, the square does not give any information about the sign of the TC. But, we can measure the signal using the triangular aperture. We explain this behavior based on diffraction patterns of each aperture.