Shostka N. Methods of formation and interaction of space structured optical beams with substance

This thesis is devoted to solving the problems of generation of optical beams with desired configuration of intensity of the light field, and their arrays, which allow trapping and manipulating microparticles in gas medium. In this manuscript are presented investigations of the field structure of bottle beams, i.e. beams with minimum of intensity in focal area, surrounded by the maximum of intensity, in anisotropic medium of uniaxial crystal. The properties of singular beams are investigated not only in paraxial regime, but and under strong focusing conditions, when initial polarization properties affects on intensity distribution in the area of the focus of high numerical objective. It is experimentally studied the intensity distribution of femtosecond circularly polarized optical vortex, focused by objective with high numerical aperture. In the work are shown basic directions of influence of an array of structured optical beams on the particles of substance in gas medium. It was considered the method of formation arrays of stable zeroes or minimums of intensity of light field in coherent and incoherent light based on using diffractive optical elements. It was performed for the first time controlled spatial shifts and turns of a large number of trapped carbon microparticles in air.