The spin angular momentum of light can induce the orbital rotation of matter via spin-orbit angular momentum conversion. In this work, we demonstrate the orbital rotation of nanoparticles using two different physical mechanisms. First, a nanoscale Poynting vector vortex is created above the nanogap of a plasmonic trimer nanoantenna upon circularly polarized laser irradiation. Using these trimer nanotweezers, single fluorescent nanodiamond trapping and rotation is experimentally achieved. Second, the orbital rotation of VO2 nanoparticles is achieved using a focused, circularly polarized Gaussian laser beam. We demonstrate that the non-linear optical response caused by the insulator-to-metal phase transition of VO2 leads to the formation of an annular trapping potential well around the center of the laser beam.
We have demonstrated a nano-particle rotation above a plasmon-resonant gold multimer nano-structures with a nano-gap and a circularly polarized laser. We have confirmed that the rotational direction depends on the number of triangle nano-structure. And the multiple position trapping has been realized with a control of triangle nano-structure.
In this paper, we have demonstrated a nano-particle rotation above a plasmonic gold trimer nano-structure with a nanogap.
We designed the plasmonic trimer nano-structure which has a resonant frequency matched to excitation and made it
with electron beam lithography with metal lift-off process. At first, with an actively rotating linearly polarized beam
excitation, we have realized a rotational motion of a trapped nano-particle synchronized to a polarization of beam. Next,
we observed a nano-particle rotation using a circularly polarized beam. From the auto-correlation of position time trace
with sinusoidal fitting, we confirmed a faster rotation of nano-particle than that of an actively rotating linearly polarized
beam.
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