In this article, we analyze the possibilities of non-contact confinement of micron-sized absorbing particles using optical traps based on a spatially structured beam. The proposed method utilizes multi-beam interference with controllable parameters including tilt angles, waists and a number of superposed beams. The effectiveness of trapping and its selectivity to variable masses and shapes of particles is determined by axial symmetry of spatial intensity distribution at the trapping area. In addition to implementing non-contact trapping, optical visualization was performed with axial digital holographic microscopy in-situ. This method contributes to the accurate localization of studied specimens inside the cuvette.
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