Figure 5
Influences of particle size and topological charge on the force.
(a) The azimuthal force exerted on gold particles with different sizes (black line) and the corresponding rotational speed (red line) at the peak of the PV donut. (b) Гn represents the torque of a particle in the PV with a topological charge of l = n and Δ is the ratio of Гn to Г5. Blue line and black dots show the theoretical prediction and FDTD result of Δ, respectively. Red line shows the corresponding rotational speed of the particle in a different PV field. All results are normalized by 100-mW-incident power.
