title: Reversal of the optical force in a plasmonic trap.
abstract: We study in detail the optical forces generated by a plasmonic trap on a plasmonic nanoparticle. The permittivity of the trapped particle is tuned using a Drude model. The interplay between the plasmon resonances of the trap and of the particle can produce different regimes leading to attractive or repulsive forces. Hence a particle will be trapped or repulsed depending on its permittivity. Such a physical system should provide new functionalities for lab-on-the-chip applications.
authors.affiliation: Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), EPFL-STI-NAM, ELG Station 11, Lausanne, Switzerland. lina.huang@epfl.ch
authors.forename: Lina
authors.initials: L
authors.lastname: Huang
authors.forename: Olivier J F
authors.initials: OJ
authors.lastname: Martin