Light fields with nonzero angular momentum for laser micrimanipulation

Methods of laser manipulation with microscopic objects are getting still wider application in science and engineering. The range of manipulation use is enlarged owing to the beams with nonzero angular momentum. Different variants of generating light fields with nonzero angular momentum are analyzed in this paper: spiral beams; light fields, obtained with the spiral beam phase mask only and those obtained with the use of iterative algorithm. The calculations of the light wave linear momentum value transferred to the latex particles along the trajectory are carried out. The experiments on micro-particles movement along the formed Archimedes-spiral and square-contour trajectories are fulfilled.