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The use of nanophotonics for optical manipulation has continuously attractedinterest in both fundamental research and practical applications, due to itssignificantly enhanced capabilities at the nanoscale. In this work, we showedthat plasmonic particles can be trapped at off-axis location in Gaussian beamsassisted by surface plasmon resonance. The off-axis displacement can be tunedat the sub-wavelength scale by the incident light beams. Based on these, wepropose that a superfast orbital rotation of particles in continuous-wave laserbeam can be realized in tightly focused circularly polarized Gaussian beams.The rotation has a tunable orbital radius at the sub-wavelength scale and asuperfast rotation speed (more than 10^4 r/s in water under common laboratoryconditions). Our work will aid in the development of optically drivennanomachines, and find applications in micro/nano-rheology, micro-fluidmechanics, and biological research at the nanoscale.

Superfast and sub-wavelength orbital rotation of plasmonic particles in focused Gaussian beams