title: Plexciton dynamics: exciton-plasmon coupling in a J-aggregate-Au nanoshell complex provides a mechanism for nonlinearity.
abstract: Coherently coupled plasmons and excitons give rise to new optical excitations--plexcitons--due to the strong coupling of these two oscillator systems. Time-resolved studies of J-aggregate-Au nanoshell complexes when the nanoshell plasmon and J-aggregate exciton energies are degenerate probe the dynamical behavior of this coupled system. Transient absorption of the interacting plasmon-exciton system is observed, in dramatic contrast to the photoinduced transmission of the pristine J-aggregate. An additional, transient Fano-shaped modulation within the Fano dip is also observable. The behavior of the J-aggregate-Au nanoshell complex is described by a combined one-exciton and two-exciton state model coupled to the nanoshell plasmon.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Nche T
authors.initials: NT
authors.lastname: Fofang
authors.forename: Nathaniel K
authors.initials: NK
authors.lastname: Grady
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Fan
authors.forename: Alexander O
authors.initials: AO
authors.lastname: Govorov
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
mesh_terms: D003198:Computer Simulation; D006046:Gold / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D017711:Nonlinear Dynamics; D010316:Particle Size; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold