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Previous research has shown that gold nanoparticles immersed in water in anoptical vortex lattice formed by the perpendicular intersection of two standinglight waves with a \pi/2 rad phase difference will experience enhanceddispersion that scales with the intensity of the incident laser. We show thatflexible nanoscale dumbbells (created by attaching two such gold particles bymeans of a polymer chain) in the same field display different types of motiondepending on the chain length and field intensity. We have not disregarded thesecondary optical forces due to light scattering. The dumbbells may disperse,rotate or remain trapped. For some values of the parameters, the (enhanced)dispersion possesses a displacement distribution with exponential tails, makingthe motion anomalous, though Brownian.

Optofluidic control of the dispersion of nanoscale dumbbells