亚纳米尺度表面等离子体量子耦合体系的构建与光学性质研究

Electron correlations between two plasmonic nanostructures driven by quantum plasmon coupling have great potential applications in nanoscale optoelectronics and single-molecule electronics. Sub-nanometer coupling distance is a prerequisite for quantum plasmon coupling to occur in self-assembled metal nanostructures. The design and fabrication of novel plasmon coupling systems with controllable metal nanostructures and tunable coupling gaps that are fully controlled by sub-nanometer linking molecules is the key to the observation of quantum plasmon coupling effect in self-assembled plasmonic systems. This project aims to combine self-assembly and surface cleaning techniques with nanoparticle transfer printing techniques to develop innovative metallic nanoparticle-film coupling systems. The distance between the metal nanoparticles and metal films will be precisely fine-tuned by sub-nanometer dithiol linking molecules. We will systematically investigate the effect of metal nanoparticle shapes and length of the linking molecules on their optical properties and unveil their quantum coupling mechanisms. It is expected that the findings in this research would provide useful information for understanding the electron transport in plasmonic quantum coupling systems and would be helpful for the design and fabricate of novel quantum coupling based photonic nanodevices.

表面等离子体量子耦合引起的电子关联效益在纳米光电学和单分子电子学领域有广泛的应用前景。亚纳米尺度耦合距离是实现量子耦合的先决条件。构建一个完全由连接分子长度控制的、金属纳米颗粒本身结构特征可调制的耦合体系，是实现在自组装体系观察到量子耦合效应的关键。本项拟以金属纳米颗粒－金属膜为研究体系，发展一种基于自组装、表面清洁技术和活体印刷术的纳米制备技术，实现纳米颗粒与金属膜间的距离由自组装分子隔离层控制，并在亚纳米尺度上对耦合距离进行精确调控，构建金属纳米颗粒－金属膜亚纳米尺度量子耦合体系。系统研究该体系表面等离子体耦合光学性质，揭示其量子耦合机制，为新型表面等离子体量子器件的研发提供理论基础和原型技术。

表面等离子体量子耦合引起的电子关联效益在纳米光电学和单分子电子学领域有广泛的应用前景。本项分别以金属纳米颗粒-金属纳米颗粒和金属纳米颗粒－金属膜为研究体系，发展基于自组装纳米制备技术，获得了隔离层材料种类和厚度可调的耦合体系。在金属纳米颗粒核-卫星体系观察到了经典耦合，即将入射电磁场聚焦在颗粒间，形成热点区域。热点区域的电磁场得到了极大的提高，实现了热点区域内分子荧光和拉曼光谱的增强。而在金属纳米颗粒－金属膜体系中观察到了量子耦合，即表面等离子体共振峰先红移后蓝移。系统研究这些体系表面等离子体耦合光学性质，并揭示部分体系的耦合机制，初步理解了热电子在量子耦合体系的传输行为，为新型表面等离子体量子器件的研发提供理论基础和原型技术。利用研究中建立的知识，初步探索了这些体系在能源（光催化产氢）和防伪（信息存储）领域的应用。