报告题目：Manipulation of light-matter interaction in optically resonant nanostructures
报 告 人：徐毅 副研究员（暨南大学信息科学技术学院）
报告时间：2017年10月30日（星期一）10:00
报告地点：理学院报告厅（理-352）
报告人简介：
徐毅，暨南大学信息科学技术学院电子工程系副研究员。他分别于2007年和2012年在华南师范大学获得学士及光学博士学位，期间曾赴澳大利亚国立大学非线性物理中心进行为期一年的联合培养。他曾获中国光学学会颁发的王大珩光学奖高校学生奖，广东省自然科学杰出青年基金和广东特支计划科技创新青年拔尖人才。徐毅博士的主要研究方向为基于微纳共振结构的光与物质相互作用调控，以第一作者、共同第一作者和通讯作者身份在Physical Review Letters, Laser Photonics Reviews, Phys. Rev. A/B, Optics Letters, EPL等光物理期刊上发表学术论文20余篇。
报告内容：
Light-matter interaction can be tailored by using structured nanoparticles. In this talk, I will present our recent results of manipulating light-matter interaction utilizing structured nanoparticles. As we know, the interaction of light with a single gold nanorod (GNR) depends strongly on the polarization and wavelength of the light. For isolated GNRs, the maximum of the wavelength-dependent linear and nonlinear absorption appear at the same wavelength. It was demonstrated that these relationships can be manipulated in a GNR assembly composed of randomly distributed GNRs. The two-photon-absorption peak of a GNR assembly can be different from its single photon-absorption peak by increasing the plasmonic coupling strength. The possibility of using the GNR assembly for ultrahigh density optical data storage is also addressed. Secondly, we introduce the concept of tunable ideal magnetic dipole scattering in a structured nonmagnetic nanoparticle. Dielectric nanoparticles with high refractive index usually support both electric and magnetic dipole modes. Thus, to achieve ideal magnetic dipole scattering one has to suppress the electric dipole response. Such a possibility was recently demonstrated for the so-called anapole mode, which is associated with zero electric dipole scattering. By overlapping magnetic dipole resonance with the anapole mode we achieve ideal magnetic dipole scattering in the far-field with tunable scattering resonances in optical spectrum. We demonstrate that such condition can be realized for two kinds of subwavelength geometries. One of them is core-shell nanosphere consisting of Au core and silicon shell. It can be also achieved in other geometries, including nanodisks, which are compatible with current nanofabrication technology. Our findings provide useful guidelines for engineering the interaction of electric and magnetic components of light with nanostrcutures.
欢迎全校师生参加。
注：本次讲座将纳入物理系继续教育课程。
理学院
2017年10月27日
