Optical Poynting singularities of propagating and evanescent vector Bessel beams

摘要

For propagating and evanescent vector Bessel beams, we study thesingularities of the Poynting vector (Poynting singularities), at which theenergy flux density turns to zero. Poynting singularities include all the phasesingularities and some of polarization ones (L- and C-points). We reveal theexistence conditions and positions of singularities, which are located atcylindrical surfaces around the beam axis. We mark the special case of theevanescent Bessel beam in the form of cylindrical standing wave, that issingular at any spatial point.