| 报告题目： |
Active and Nonlinear Plasmonics |
| 报告人： |
Prof. Wenshan Cai (蔡文杉教授) |
| 报告人单位： |
佐治亚理工学 |
| 报告时间： |
2018年6月26日16:00-18:00 |
| 报告地点： |
科技楼北418 |
| 报告摘要： |
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Nanostructured metals have offered not only the unprecedented opportunity to generate unconventional electromagnetic properties that are not found in nature, but also the exciting potential to create customized nonlinear media with tailored high-order effects. Two particularly compelling directions of current interests are active nanophotonics, where the optical properties can be purposely manipulated by external stimuli, and nonlinear optics, which enable intensity-dependent frequency conversion of light. By exploring the interaction of these two directions, we leverage the electrical and optical functions simultaneously supported in nanostructured metals and demonstrate electrically-controlled nonlinear processes from plasmonic metamaterials. We show that a variety of nonlinear optical phenomena, including the wave mixing and the optical rectification, can be purposely modulated by applied voltage signals. In addition, electrically-induced and voltage-controlled nonlinear effects facilitate us to demonstrate the backward phase matching in a negative index material, a long standing prediction in nonlinear metamaterials. Other results to be covered in this talk include photon-drag effect in plasmonic structures and ion-assisted nonlinear effects from metamaterials in electrolytes. Our results reveal a grand opportunity to exploit plasmonic metamaterials as self-contained, dynamic electrooptic systems with intrinsically embedded electrical functions and optical nonlinearities. |
| 报告人简介： |
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Prof. Wenshan Cai (蔡文杉教授) 于2012年加入佐治亚理工学院，任电子与计算机工程系副教授(tenured)，并同时受聘于材料科学与工程学院。他在2000年和2002年分别获得清华大学物理电子学专业的本科和硕士学位，2008年获得普渡大学电气/电子工程博士学位，并曾在斯坦福大学先进材料Geballe实验室担任博士后研究员。他的研究集中在微纳光子材料和器件方向，并在等离子体激元和超材料领域做出了尤其突出的贡献。蔡博士在Science, Nature Materials, Nature Photonics, Nature Nanotechnology等期刊上发表论文50余篇，论文引用量已经超过10000次，并获得过多项国家和国际奖项，包括OSA/SPIE Joseph W.Goodman书作奖（2014），CooperVision科学与技术奖（2016）和海军研究青年研究者奖（2017）。他所撰写的《光学超材料：基础与应用》已经在全世界范围内作为教材和主要参考书目被广泛使用。 |
