磁性共振是实现电磁超材料的必要条件，且是一种有效增强物质和磁场作用的方法，然而光频波段磁性共振只能通过人为设计具有特殊对称性的纳米结构来实现。本项目拟开发能够在单个颗粒中产生磁性共振的纳米结构的湿化学制备方法，并研究其磁性共振性质、磁性共振耦合、磁性与电性共振耦合、以及其对磁偶极辐射的调控作用。通过研究金的成核和生长动力学与热力学，开发金纳米杯和缺口金纳米环的可控湿化学制备方法；通过研究不同形貌与结构的金纳米杯和缺口金纳米环中的磁性共振性质，阐明磁性共振随形貌和结构的演变规律；采用不同构型的二聚体，研究磁性共振之间以及磁性共振与电性共振之间的耦合随二聚体构型的变化规律；以稀土纳米颗粒中磁偶极辐射为代表，研究磁性共振调控前后磁偶极辐射的强度、方向、偏振及谱形的变化，揭示磁性共振对磁偶极辐射的增强和调控机制。本项目开发的制备方法及磁性共振性质研究，为基于磁性共振的应用提供理论依据和技术积累。

Magnetic resonances are required for the realization of electromagnetic metamaterials. They also provide an effective way to enhance the interaction between matters and magnetic field of light. However, the realization of magnetic resonances in optical range requires to artificially design nanostructures with special symmetry. In this proposal, we will develop wet-chemistry method for the preparation of nanoparticles that can support magnetic resonance in individual nanoparticles. The magnetic resonances of the nanoparticles, the coupling of the magnetic resonance and between magnetic and electric resonances will be systematically studied. We will also study the control of magnetic resonance on the emission of magnetic dipole. We will develop a facile wet-chemistry preparation method for Au nanocups and split nanorings by the control of the nucleation and growth kinetics and thermodynamics. The evolution of magnetics resonances with the morphologies and structures of Au nanocups and nanorings will be systematically studied. We will also unraveling the magnetic resonance-based coupling of nanostructure dimers with various configurations. Finally, by choosing rare-earth nanoparticles, we will study the control of magnetic resonances on the emission of magnetic dipole. We foresee that the success of this project will lead to the production of high-quality colloidal Au nanocups and nanorings supporting strong and energy-variable magnetic plasmon resonance at low cost. Moreover, the unique geometries of Au nanocups and nanorings will offer unprecedented opportunities for studying the interactions of magnetic plasmon resonance with other optical processes, which will greatly contribute to the understanding of magnetic plasmon resonances and their interactions at the nanoscale.