We report on vortex-solitons generated in dye-doped nematic liquid crystals by a purely optothermal nonlocal nonlinearity. This response not only supports stable doughnut-shaped ordinary-wave beams with orbital angular momentum, but also provides self-confined solitary waves with excellent trajectory and profile stability over time. Using an interferometric technique, we also investigate the role of nonlocal nonlinearity in the non-illuminated axial region.
Kwaśny, M., Karpierz, M.A., Assanto, G., Laudyn, U.A. (2020). Optothermal vortex-solitons in liquid crystals. OPTICS LETTERS, 45(8), 2451-2453 [10.1364/OL.388340].