Manuel I Marqués
IFIMAC - Universidad Autonoma de Madrid, Spain
Title: Electromagnetic drag and diffusion control
Biography
Biography: Manuel I Marqués
Abstract
Fluctuating isotropic electromagnetic fields are obtained by considering a group of plane waves with wave vectors, polarizations and phases randomly distributed and fluctuating on time. Due to the isotropic character of this electromagnetic field, the optical force induced on a nanoparticle is, in average, equal to zero. However, the dynamics of electric dipoles on these kind of systems are far from being trivial. Due to the nonzero value of the optical force fluctuations, super diffusive, diffusive and accelerated regimens are induced on a single dipole. In this work, the expressions for the random force fluctuations, the optical drag force, the equilibrium kinetic energy and mean square displacement are derived. The conditions to be fulfilled by the polarizability of the dipole in order to obtain a positive, a null, and a negative drag coefficient are analytically determined and checked against numerical simulations for the dynamics of a silver nanoparticle.