By sending a light beam on a homeotropic nematic liquid-crystal cell subjected to a voltage with a photosensitive wall, a stable matter vortex can be induced at the center of the beam. When the applied voltage is decreased, the vortex disappears from the illuminated region; however, the system shows a stationary molecular texture. Based on a forced Ginzburg-Landau amplitude equation, we show that the vortex with a core of exponentially suppressed amplitude always remains in a shadow region below instability threshold and that the observed texture is induced by its phase distribution. This is a different type of vortex phase singularity solution. Numerical simulations and experimental observations show a quite fair agreement.
Light-matter interaction induces a shadow vortex / Barboza, R.; Bortolozzo, U.; Clerc, M. G.; Davila, J. D.; Kowalczyk, M.; Residori, S.; Vidal-Henriquez, E.. - In: PHYSICAL REVIEW. E. - ISSN 2470-0045. - ELETTRONICO. - 93:5(2016), p. 050201. [10.1103/PhysRevE.93.050201]