Transverse and lateral shifts of the center of gravity of a refracted nonparaxial Bessel beam

摘要

By applying geometrical optics (GO) to each plane-wave component of a nonparaxial electromagnetic (em)nBessel beam carrying spin and orbital angular momentum (SAM and OAM), we calculate the shift of thenbeam centroid during propagation in a weakly inhomogeneous, isotropic medium. Apart from recovering thentransverse spin and orbital Hall shifts expected from paraxial theory, the nonparaxial treatment reveals additionalnshifts in both the transverse and lateral directions.When the propagation is close to perpendicular to the refractivenindex gradient, these shifts should be significant also for nearly paraxial beams. Suggestions are given for annexperimental verification of the results.