Application of axial symmetric phase plate and circular diffraction waveplate in optical tweezers

V. K. Abrahamyan

In development of optical tweezers can be used diffractive optical elements, as laser beam steering systems, as well the phase plates, which allow modulating the intensity distribution of the laser beam for manipulating trapping forces. The system, consisting of an axial symmetric phase retarder–glass substrate coated by axially symmetric oriented liquid crystal (LC) polymer, and a circular diffraction wave plate–glass substrate, coated by LC polymer with polarization patterned orientation, is considered. Diffracted beams are obtained at the output of the system in ±1 order, the intensity distribution in which is determined by the state of light polarization at the system input. The possibility of use this system for trapping, scrolling and moving the particles of micro- and nanosizes by modification of the shape and intensity of the beams at the system output is considered.

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