Giant enhanced diffusion of gold nanoparticles in optical vortex fields.
basic_science · Level V
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- Record sourced from PubMed, PMID 19673533.
- Also identified by DOI 10.1021/nl901745a.
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Abstract
We study the diffusion of a metal nanoparticle in the nonconservative force field of an optical vortex lattice. Radiation pressure in the vortex array is shown to induce a giant enhancement over the free thermal diffusion. Langevin dynamics simulations show that the diffusion coefficient of (50 nm radius) gold particles at room temperature is enhanced by 2 orders of magnitude at power densities of the order or smaller than those used to trap nanoparticles with optical tweezers.