石墨烯-贵金属低维复合结构光学性质研究

把石墨烯物理和等离激元光子学（plasmonics）相结合，研究由石墨烯、金属纳米结构、量子发射子(quantum emitter)构成的低维复合体系光学性质。探究与具有线性色散关系的Dirac型激发相联系的光学新特征，考察不同属性个体激发、集体激发相互作用导致新型激发元的特点及其光学表现；利用内禀调控和外部剪裁（石墨烯掺杂，层数、金属颗粒尺寸、形状，阵列结构等）手段，研究体系与带间激发和带内激发相联系光学性质的调节，及对突破衍射极限的局域场调控；分析耦合效应/局域场增强效应和耗散效应的竞争；研究基于局域场的有效调控，对量子发射子光学过程的调节，特别注重干涉效应、非线性效应；发展基于自洽场耦合的理论模型及密度矩阵、格林函数理论与FDTD模拟相结合的理论方法，提出通过子结构耦合调控局域场的有效手段。工作将深化人们对低维体系中光与物质相互作用规律的认识，并为基于低维结构的功能器件设计提供基础。

By combining the physics of graphene and plasmonics, we perform the research on the optical properties of low dimensional hybrid structures of graphene, metallic nanostructure and quantum emitter. We explore the new optical characteristics related to the Dirac excitation with linear dispersion relation, and study the features and optical properties of new excitations due to the interaction among the individual excitations and collective excitations of different nature. Making use of the intrinsic modulation and external tailoring (doping, layer number control, the design of the size, shape of metallic nanoparticles and the structures of nanoparticle arrays), we study the interband transtion/intraband transition induced optical properties and the modulation of the local field beyond the diffraction limit. We analyze the competition among the coupling effect, local field enhancement effect and the dissipation effect. Based on the effective modulation of the local field, we study the tailoring of the optical process of the quantum emitters, paying special attention to the interference effect and nonlinear effect. We develop the modeling based on the self-consistent coupling theory and the theoretical methods combing the theory of density matrix and Green's function and the FDTD simulation. We propose the effective technique of local field modulation through the coupling among the substructures. Our work will deepen the understanding of the basic principle of light-matter interaction in low dimensional systems, and provide the bases for the design of functional devices based on low dimensional structures.