Micro-object manipulation by laser beams with nonzero orbital momentum

Possibilities of the laser manipulation with microscopic objects could be sufficiently expanded by using of the beams with predetermined spatial intensity and orbital momentum density distributions in the focusing plane. The experiments on the visualization of the wave front of the beams with nonzero orbital momentum by using controllable liquid crystal plate are described. The experimental results presented on trapping, rotation and motion along a specified trajecotry of absorbing particles by means of the beams.