Precise position and angular control of optical trapping and manipulation via a single vortex-pair beam

Switchable optical trapping based on vortex-pair beams generated by a polarization-multiplexed dielectric metasurface

“…When the paired vortices are positioned in close proximity, they may undergo both collision and destructive interference and they eventually vanish. 31 Finally, the intensity distribution at the focal plane is mostly symmetrically centered along the y -axis, and only a single bright spot is activated to hold a microparticle, as shown in Fig. 6(b).…”

“…Finally, a group of 8 × 8 highly efficient nanoposts, independently allowing for full 2π-phase modulations for both TE and TM polarizations, was selected to make up the metasurface, as indicated by the black stars. The vortex-pair phase of the proposed metasurface can be expressed aswhere E ϕ refers to the light field of a vortex-pair beam at the initial plane 31 and was calculated asHere m 1 and m 2 are integer topological charges, a is the off-axis distance of each vortex, and ( x , y ) allude to the coordinates corresponding to the center of a unit cell constituting each metasurface. The phase formula adopted to generate the vortex-pair beam is based on an artificially designed phase function.…”

“…A vortex-pair beam is a type of structured light beam that incorporates a pair of vortices with the same or opposite topological charges in the phase plane. [29][30][31][32] Each vortex stems from a region where the phase of the electromagnetic field rotates with respect to a phase singularity, thus creating a helical wavefront. 33,34 The sign of the two topological charges determines the direction of phase rotation.…”

Symmetric Swallowtail Beams in the Rectangle Frame

“…In the field of the optical trap of the structured light, [ 28 ] researchers have demonstrated some optical manipulation on particles, depending on the peculiarity of types of catastrophe beams and vortex beams. [ 20,29–31 ] Here we also have an exploration of trapping particles in a special arrangement. In Figure 8 a, the incoming SSBs are reflected on the DM and the mirror in succession and eventually reach the sample plate on the stage available for triaxial precision displacement.…”

Dynamic single microparticle manipulation in the far-field region using plasmonic vortex lens multiple arms with a circular groove

“…[15][16][17][18] OV tweezers have been proposed to trap and rotate the particle, such as 1D gold dimer array, 19 perfect optical vortices (POVs) with two axicons, 20 metallic particle trimer trapping, 21 and single vortex-pair beams. 22 This OV based on OAM also has been utilized to rotate various kinds of tiny objects, such as red blood cells, calcite, silica, and vaterite particles. 23 Surface plasmon polaritons (SPPs) efficiently generate a high field intensity localization and break the subwavelength diffraction limit.…”