Single Particle Spectroscopic Investigation on the Interaction between Exciton Transition of Cyanine Dye J-Aggregates and Localized Surface Plasmon Polarization of Gold Nanoparticles
Single Particle Spectroscopic Investigation on the Interaction between Exciton Transition of Cyanine Dye J-Aggregates and Localized Surface Plasmon Polarization of Gold Nanoparticles
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DOI：
10.1021/jp067565n
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发表时间：
2007-01
影响因子：
3.7
通讯作者：
T. Uwada;R. Toyota;H. Masuhara;T. Asahi
中科院分区：
文献类型：
--
作者：
T. Uwada;R. Toyota;H. Masuhara;T. Asahi
通过测量单个金纳米颗粒表面包覆菁染料J-聚集体的光散射光谱，研究了分子激子与局域表面等离子体激元（LSP）极化之间的相互作用。J-聚集体的吸收谱带随粒径和J-聚集体与金纳米颗粒表面的距离而变化。通过对实验结果与基于Mie理论的理论计算的比较，我们证明了当激子共振峰位于激子共振峰附近，且J聚集体与金属表面的距离较短时，激子共振极化对J聚集体吸收带的峰和形状的影响。激光冲击诱导的J-聚集态激子带的改变被认为是由于分子激子跃迁和金属纳米粒子的激光冲击共振之间的强耦合。
The interaction between molecular exciton and localized surface plasmon (LSP) polarization has been investigated by measuring light scattering spectra of single gold nanoparticles coated with cyanine dye J-aggregate. The spectral dip reflecting absorption spectral band of the J-aggregate varies with the particle size and the distance between the J-aggregates and the surface of gold nanoparticles. By comparing the experimental results with theoretical calculations based on the Mie theory, we demonstrate that the LSP polarization affects the peak and shape of the J-aggregate absorption band when the exciton resonance peak locates near the LSP resonance peak and when the separation of the J-aggregate from the metal surafce is short. The modification of the J-aggregate exciton band induced by LSP is considered to be due to strong coupling between the molecular exciton transition and the LSP resonance of metallic nanoparticles.