Plexciton Dynamics: Exciton−Plasmon Coupling in a J-Aggregate−Au Nanoshell Complex Provides a Mechanism for Nonlinearity
作者： Nche T. Fofang , Nathaniel K. Grady , Zhiyuan Fan , Alexander O. Govorov , Naomi J. Halas
DOI: 10.1021/NL104352J
关键词: Ultrafast laser spectroscopy 、 Observable 、 Materials science 、 Molecular physics 、 J-aggregate 、 Optics 、 Degenerate energy levels 、 Fano resonance 、 Plasmon 、 Nanoshell 、 Exciton
摘要: Coherently coupled plasmons and excitons give rise to new optical excitations- plexcitons − due the strong coupling of these two oscillator systems. Time-resolved studies J-aggregate-Au nanoshell complexes when plasmon J-aggregate exciton energies are degenerate probe dynamical behavior this system. Transient absorption interacting plasmon-exciton system is observed, in dramatic contrast photoinduced transmission pristine J-aggregate. An additional, transient Fano-shaped modulation within Fano dip also observable. The complex described by a combined one-exciton two-exciton state model plasmon.
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