Plexciton Dynamics: Exciton-Plasmon Coupling in a J-Aggregate-Au Nanoshell Complex Provides a Mechanism for Nonllinearity

被引：261

作者：

Fofang, Nche T. ^{[1
,3
]}

Grady, Nathaniel K. ^{[2
,3
]}

Fan, Zhiyuan ^{[4
]}

Govorov, Alexander O. ^{[4
]}

Halas, Naomi J. ^{[1
,3
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[3] Rice Univ, Lab Nanophoton, Houston, TX 77005 USA

[4] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 04期

基金：

美国国家科学基金会;

关键词：

Plexcitons; plasmons; excitons; nanoshells J-aggregates; Fano resonance; NONLINEAR-OPTICAL PROPERTIES; RESONANCES; NANOPARTICLES; ABSORPTION;

D O I：

10.1021/nl104352j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Coherently coupled plasmons and excitons give rise to new optical excitations-plexcitons - due to the strong coupling of these two oscillator systenfis. Time resolved studies ofJ-aggregate-Au nanoshell complexes when the nanoshell plasmon and yaggregate 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 plasrnon.

引用

页码：1556 / 1560

页数：5

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