报告题目：Optical properties of hybrid nanostructures: the interference effect & the chiral response

报告人：张伟 研究员（北京应用物理与计算数学研究所）

报告时间：3月24日，下午15:30-16:30

报告地点：物理学院新楼五楼多功能报告厅

报告摘要：Modern nanotechnology opens the possibility of combining nanocrystals of various materials with very different characteristics in one superstructure. In this talk, I will present our studies on the optical properties of hybrid nanostructures, focusing on the interference effect and the chiral response. Based on the semiclassical and complete quantum theories, we show that the interplay among different modes leads to interesting interference effects: the Fano effect/plasmon analogy of electromagnetic induced transparency. The tunable hybrid nanostructures not only lead to tunable interference effect, but also bring about strong chiral responses in certain designed structures. The interaction between molecules and metallic nanorods (NPs) leads to strong induced plasmonic circular dichroism (CD), which can be manipulated by the conformation of the nanoassemblies. In particular, the side-by-side assembled Au nanorods (NRs) show stronger plasmonic CD than that of end-to-end assemblies. The dual roles of intrinsic chirality and accurate binding site control of DNA origami lead to tunable anisotropic optical activity of Au NR dimers and Au nanorod-nanosphere heterodimers. The DNA-based assembly provides a remarkable spatial control of plasmonic nanostructures, which results in both the induced CD and structural CD.

报告人简介：张伟，北京应用物理与计算数学研究所，研究员。1998年于中科院理论物理研究所获博士学位，1998至2000年在北京应用物理与计算数学研究所做博士后，2001至2007年在美国做博士后/研究学者，2007年8月至今，研究员，北京应用物理与计算数学研究所。张伟在低维凝聚态/纳米体系的光学、电输运性质等方面做了系统的研究工作，在包括Nature、Phys. Rev. Lett.、Advanced Materials、 Angew. Chem. Int. Ed.、 Nano Lett.、 ACS Nano、J. Am. Chem. Soc.等的国际核心期刊上发表SCI论文80余篇。曾获“于敏数理科学奖”，“中物院科技创新奖”。

邀请人：王取泉教授