Interaction between Frenkel exciton and surface plasmon

弗兰克尔激子和表面等离子体激元之间的相互作用

• 批准号: 13650882
• 负责人: SATO Tomoo
• 金额: $ 2.62万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650882/
• 关键词: Surface Plasmon; Exciton; Noble Metal Nano Particles; J-aggregate; Cyanine Dye; Suppressive Interaction; Enhanced Interaction; Dipole-Dipole Interaction Model; 吸収増強; 発光増強; 銀ナノ粒子; 金ナノ粒子; 吸収スペクトル温度依存性

We have found a unique spectroscopic property of noble metal nano-particles directly covered with a J-aggregate monolayer (J-aggregate/noble metal nano particle). In the absorption spectra, the spectral dip at the position of the J-band was observed in the surface plasmon band. The anomalous spectral feature has been observed only in the case of the adsorption of cyanine dyes, whose J -band was in the surface plasmon band of metal particles. The dip did not appear for other dyes adsorbed on the metal particles as monomer, dimer, H-aggregate and J-aggregate whose J-band was in the interband transition band of the metal. On the other hand, cooling down the temperature from 290 K to 90 K has brought about increase of the dip area and blue shift of the dip position and the narrowing of the dip width. We have supposed that the appearance of the dip is related to the strong suppressive interaction between the surface plasmon and Frenkel exciton.In the case of J-aggregate/aminothiol/noble metal nano particle, we have found special new features as absorption enlargement in the region of the J -band, surface plasmon-mediated strong resonance fluorescence, and considerable expansion of effective wavelength region for excitation of the J-aggregate. These special features would suggest the enhanced interaction between the surface plasmon and Frenkel exciton. It is important that the excited-state J-aggregate can be generated much more efficiently and in much wider region of wavelength, because we could expect the largely increasing the overall light-harvesting efficiency.The observed both spectral features in this work, suppressive and enhanced interactions, could be reproduced by a simple dipole-dipole interaction model. It has been suggested that difference of the surface morphology of the noble metal nano particle induces the different interaction mode.

我们已经发现了一个独特的光谱性质的贵金属纳米粒子直接覆盖J-聚集体单层（J-聚集体/贵金属纳米粒子）。在吸收光谱中，在表面等离子体激元带中观察到J带位置处的光谱凹陷。只有在菁染料吸附的情况下才观察到这种反常的光谱特征，其J带位于金属颗粒的表面等离子体带。吸附在金属颗粒上的其他染料，如单体、二聚体、H-聚集体和J-聚集体，其J-带位于金属的带间跃迁带内，则没有出现这种下降。另一方面，温度从290 K冷却到90 K，导致浸渍面积增加，浸渍位置蓝移，浸渍宽度变窄。在J-聚集体/氨基硫醇/贵金属纳米粒子的情况下，我们发现了J-聚集体在J -带区域的吸收放大、表面等离子体介导的强共振荧光以及激发J-聚集体的有效波长范围的显著扩展等特殊的新特征。这些特殊的特征表明表面等离子体激元和Frenkel激子之间的相互作用增强。重要的是，激发态J-聚集体可以更有效地产生，并在更宽的波长范围内，因为我们可以预期大大提高整体的光捕获效率。在这项工作中观察到的两个光谱特征，抑制和增强的相互作用，可以通过一个简单的偶极-偶极相互作用模型再现。研究表明，贵金属纳米粒子表面形貌的差异导致了它们之间的相互作用方式不同。

项目成果

Spectroscopic Properties of Noble Metal Nano-Particles Covered with J-Aggregates of Cyanine Dye

花青染料 J-聚集体包覆贵金属纳米粒子的光谱性能

• 发表时间: 2001
• 期刊: Chemistry Letters 2001
• 作者: Tomoo Sato

Fusahiro Tsugawa, Toshinori Tomita, and Mitsuo Kawasaki, Spectroscopic Properties of Noble Metal Nano Particles Covered with J-Aggregates of Cyanine Dye

Fusahiro Tsukawa、Toshinori Tomita 和 Mitsuo Kawasaki，花青染料 J 聚集体覆盖的贵金属纳米粒子的光谱特性

• 发表时间: 2001
• 期刊: Chemistry Letters 2001
• 作者: Tomoo Sato;Tomoo Sato
• 通讯作者: Tomoo Sato