Giant enhanced diffusion of gold nanoparticles in optical vortex fields.
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.
Albaladejo
Silvia
S
Departamento de Fisica de la Materia Condensada, Departamento de Fisica de Materiales, Universidad Autonoma de Madrid, E-28049 Madrid, Spain.
Marqués
Manuel I
MI
Scheffold
Frank
F
Sáenz
Juan Jose
JJ