title: Surface-mediated four-wave mixing of nanostructures with counterpropagating surface plasmon polaritons.
abstract: We demonstrate that four-wave mixing (FWM) signals from individual Si nanoparticles can be generated by the surface fields of traveling surface plasmon polariton modes. We have chosen a counterpropagating excitation scheme in which the nanoparticle is exposed only to surface excitation fields and not to direct laser illumination. We show that background-free, surface-mediated FWM of nanoparticles can be acquired, and that the resulting nonlinear radiation is coherent.
authors.affiliation: Department of Chemistry, University of California, Irvine, Natural Sciences II, Irvine, California 92697, USA.
authors.forename: Xuejun
authors.initials: X
authors.lastname: Liu
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Eric Olaf
authors.initials: EO
authors.lastname: Potma