纳米体系手征光学性质研究

结合多样、可调的纳米体系实验新成果,我们开展纳米体系手征光学性质的研究。该项目将研究由量子点,金属纳米颗粒,手征分子等作为基本基石构成的复合纳米体系对不同偏振光的不同响应（圆二色谱等）,揭示纳米尺度手征性产生的机制；考察体系中多种效应(受限效应,几何对称性效应,近场效应等)的综合作用;探究复合纳米体系空间构型与体系手征性的关系；研究体系个体激发（激子）与集体激发（等离激元）的相互作用，特别关注其在体系手征光学性质中的表现；分析不同起源、机制的手性的相对作用；提出利用复合纳米体系可调性实现广泛区间（紫外、可见光、红外）手征性并对其调控的有效手段；建立基于经典电磁场理论和量子密度矩阵的理论模型，发展有效解析和数值计算方法，分析、解释、理解相关实验，并提出新实验设计原理方案。该项目研究将深化人们对纳米体系基本物理规律，特别是纳米尺度手征性的认识，它在生物医学等方面有重要作用。

We conduct research on the chiral optical properties of nanostructures combining with the recent experimental results of such variable and tunable systems. We study the different optical response to the light with different polarization (circular dichroism,etc) of the hybrid nanostructures made of quantum dots, metallic nanoparticles, chiral molecules, etc. We try to reveal the mechanisms of chirality at nanoscale. We investigate the interplay of several effects (quantum confinement effect, geometry and symmetry effect, near field effect,etc); We explore the relation between spatial configuration and charility in the composite nanostructures; We study the interaction between the single particle excitations (excitons) and collective excitations (plasmons), paying special attention to their roles in the chiral optical properties; We analysis the relative roles of charility of different mechanism and origin. With the help of the tunability of hybrid nanostructures, we put forward effective methods for generation and modulation of chirality in the systems in a wide range (including UV, visible light and IR regimes). We construct theoretical models based on the classical electrodynamics and quantum density matrix theory, and develop effective analytical and numerical methods, to analyze, explain and understand the relevant experiments and propose design principle for new experiments. This study will deepen our understanding of the basic physical principle of nanostructures, in particular the understanding of chirality at nanoscale, which has important applications in biomedicines.