Transverse shifts and time delays of spatiotemporal vortex pulses reflected and refracted at a planar interface

Abstract Transverse (Hall-effect) and Goos–Hänchen shifts of light beams reflected/refracted at planar interfaces are important wave phenomena, which can be significantly modified enhanced by the presence intrinsic orbital angular momentum (OAM) in beam. Recently, optical spatiotemporal vortex pulses (STVPs) carrying a purely transverse OAM were predicted theoretically generated experimentally. Here we consider reflection refraction such isotropic interface. We find confirm numerically novel types OAM-dependent longitudinal pulse shifts. Remarkably, regarded as time delays, appear, contrast to well-known Wigner delay, without temporal dispersion reflection/refraction coefficients. Such delays allow one realize OAM-controlled slow (subluminal) fast (superluminal) propagation medium dispersion. These results have implications various problems involving scattering localized states OAM.