项目名称： Au纳米棒-CdSe异质纳米材料的构建及其光学性能研究

项目编号： No.11504105

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 梁珊

作者单位： 湖南师范大学

项目金额： 24万元

中文摘要： 金属-半导体异质纳米材料由于表面等离激元与激子的集成，以及组元间协同效应，展现出许多新奇物理化学特性，在微纳光子学领域具有重要研究价值。本项目拟在已有研究基础上可控合成Au纳米棒-CdSe异质纳米结构并对其光学性能展开深入研究。主要研究内容包括CdSe纳米晶在Au纳米棒表面的可控生长及其生长机制的探索；在实验上通过吸收光谱、发射光谱、荧光寿命谱以及Z扫描技术研究材料线性与非线性光学属性对其结构参数与激发条件的依赖关系；理论上运用时域有限差分法模拟分析体系表面等离激元共振特性，结合实验结果，进一步研究Au-CdSe异质纳米体系表面等离激元-激子相互作用影响材料光学性能的物理机制，实现材料光学性能的共振增强与人工调控。本项目旨在为光与物质相互作用研究与应用提供具备优良光学性能的金属-半导体纳米结构，我们前期工作积累为本项目的开展奠定了基础。

中文关键词： Au纳米棒；金属-半导体异质纳米结构；光学性能；表面等离激元-激子相互作用

英文摘要： Metal-semiconductor hetero-nanomaterials that integrate surface plasmon and exciton in nanoscale, along with the synergistic properties, present many novel physical and chemical properties, which have significant application in the field of micro/nano photonics. In this proposal, we will investigate the controllable synthesis of Au nanorod-CdSe hetero-nanostructures and their optical properties based on our previous works. The growth mechanism of CdSe nanocrystals on Au nanorods will be explored, and we will obtain the Au-CdSe hetero-nanorods with controlled morphologies, structures, sizes and spatial distributions. The influence of structure parameters and excitation conditions on the linear and nonlinear optical properties of the hetero-nanomaterial will be investigated with absorption spectra, photoluminescence spectra, fluorescence lifetime spectra and Z-scan system. Subsequently, the surface plasmon resonance properties of the metal-semiconductor hetero-nanosystems will be systematically analyzed using FDTD numerical simulation. Combining the experimental results and theoretic analysis, the influence mechanism of plasmon-exciton interaction on the optical properties for Au-CdSe hetero-nanorods will be clarified. Finally, it will be achieved that the optical properties of the Au nanorod-CdSe hetero-nanomaterials are resonace enhanced and artificially controlled. Through this project, a new metal-semiconductor nanostructure which aims at the supply for the research of light-matter interaction and for the potential applications will be provided. Our previous works have laid a foundation for this project.

英文关键词： Au nanorod;metal-semiconductor hetero-nanostructure;optical property;plasmon-exciton interaction