报告题目：Electromagnetic Asymmetry, Optical Magnetism and Spin Flipping in Plasmonic Nanocavities

报告人：雷党愿 教授，香港城市大学

主持人：李志远 教授、副院长

报告时间：2023年12月18日（星期一）下午3:00

报告地点：物理与光电学院18号楼213报告厅

欢迎广大师生参加！

物理与光电学院

2023年12月15日

报告摘要：In general, symmetric plasmonic nanocavities, such as a pair of two closely spaced metal nanospheres of the same size and constituting material, support only symmetry-allowed bright modes under light illumination. Breaking the cavity symmetry introduces mode hybridization between its bright and dark modes, leading to new plasmon modes like Fano resonance and bound states in the continuum. In this talk, I will go on to discuss four “dark” aspects of symmetry-broken plasmonic nanocavities, including 1) light-induced electromagnetic asymmetry for enhancing the surface second-harmonic generation (SHG) of noble metals, a mechanism well beyond conventional enhancement strategies (Nature Communications 2021, 12, 4326), 2) molecular conductivity induced second-order nonlinear optics in a plasmonic molecular nano-junction (Nano Letters 2023, 23(12), 5851-5858), 3) plasmon-induced optical magnetism in an asymmetric nanoparticle dimer-on-mirror cavity and its theoretical implication as a new second-order nonlinear source (Laser & Photonics Reviews 2020, 14(9), 200068), and 4) cavity-assisted brightening of quantum mechanically spin-forbidden dark excitons in monolayer transition metal dichalcogenides (Nano Letters 2022, 22(5), 1915-1921).

报告人简介：雷党愿，香港城市大学教授，伦敦帝国理工学院博士和教务长物理学访问教授，香港青年科学院院士，国家优秀青年科学基金（港澳）和香港研资局“杰出青年学者计划基金”获得者，科技部国家科技专家。主要从事低维量子材料和纳米结构的极化激元物理和非线性光学的实验研究，利用超快光谱技术和超分辨成像研究低维材料新颖的光学特性，探索其在新型微纳光电子器件、高分辨光学成像、单分子量子传感、信息加密与处理以及能量转换、存储与节能方面的应用。自2007年起在 Nature Communications, Science Advances, Physical Review Letters, Light: Science & Applications, Nano Letters/ACS Nano, Advanced (Functional/Optical) Materials等国际一流期刊发表学术论文220余篇，h-index为63，总引用12000多次。三篇文章分别被Science杂志作为Editor’s Choice和Nature Materials杂志作为Research Highlights报道，五篇文章分别入选英国皇家化学学会Journal of Materials Chemistry A和Journal of Materials Chemistry C杂志Emerging Investigators专刊、英国物理学会Journal of Optics杂志Emerging Leaders专刊、Wiley EcoMat杂志Young Investigator专刊以及the list of Top 50 Most Read Nature Communications Articles of 2020 in Physics。