Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows

摘要

a Results for the case of the ring uniform ξ-trap, b ring 2-sector ξ1,2-trap and c ring ξ(φ)-trap. The intensity and phase distribution of the trapping beam (optical ring trap) are displayed in the first row for the uniform ξ-trap (a), 2-sector ξ1,2-trap (b) and ξ(φ)-trap (c). These distributions have been used in the numerical simulation, providing the predicted trajectory and tangential speed vφ of the NP (gold sphere of radius 200nm) for each optical trap, as displayed in the second row. The numerical simulation results are in good agreement with the experimental results (measured NP position, tracking duration of 20s) shown in the last row; see Videos S1–S3 for each corresponding case