Dynamic modulation of optical potential wells and rotating nanoparticles by radiation force

Flexible adjustment of optical trap stiffness and the photoinduced rotation effect of multiple optical traps have broad application prospects in the quantum field. Research has shown that a flexible and controllable array of Gaussian optical traps offers the advantages of adjustable trap positions, the ability to rotate nanoparticles, the generation of distinct beam shapes through trap stiffness modulation, and simultaneous trapping of two types of nanoparticles with different refractive indices. Based on the distribution formula of the array of Gaussian beams, this study establishes the dynamic regulation of the gradient fields of arbitrary single or multiple beams within a multi-beam optical trap, thereby enabling particle rotation manipulation. This manipulation depends solely on the optical field properties of a single specialized beam.