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.
© 2008 Optical Society of America
Optics at Surfaces
Original Manuscript: September 17, 2008
Manuscript Accepted: October 20, 2008
Published: December 12, 2008
Vol. 4, Iss. 2 Virtual Journal for Biomedical Optics
Lina Huang and Olivier J. F. Martin, "Reversal of the optical force in a plasmonic trap," Opt. Lett. 33, 3001-3003 (2008)