Title: Plasmonic and Metamaterial Nanophotonic Devices

Speaker: Prof. Min Qiu

Time: 19:30, Jan.26 2010

Venue: Room A101 At WNLO

Abstract:

Noble metals start to play a key role in the field of nanophotonics, in particular, by utilizing their plasmonic effects and metamaterial structures. Plasmonic nanophotonic devices, which allow sub-wavelength confinement for optical modes, have shown the tremendous potential applications particularly in ultra-compact photonic integrated circuits, LEDs, sensors, and detectors. Meanwhile, optical metamaterials, which are artificially structured materials made from arrays of subwavelength “meta-atoms”, can be designed to display fascinating physical properties and promise many potential applications. Both plasmonic and metamaterial devices have noble metals (e.g. Au, Ag) as the main composition element. In this talk, I will review our recent works on plasmonic and metamaterial nanophotonic devices. An experimentally demonstrated high efficiency surface plasmonic coupler composed of a tapered silicon strip waveguide and a sub-wavelength scale metal gap waveguide will be presented. The design, characterization and experimental demonstration of an ultrathin, wide-angle, sub-wavelength perfect metamaterial absorber for optical frequencies will also be shown. Our experimental results show that an absorption peak of 88% is achieved at the wavelength of ~ 1.58 µm, and theoretical results even give near perfect absorption. Our other related research efforts, such as invisibility cloaking using plasmonic effects and metamaterials will also be discussed in the present talk.

Biography:

Min Qiu received the B.Sc. degree from the Zhejiang University, Hangzhou, China, in 1995, and the Ph.D. degree in Condensed Matter Physics from the same university in 1999. He received his second Ph.D. degree in Electromagnetic Theory from KTH in 2001. He joined KTH in Kista 2001 as an Assistant Professor and was awarded the so called Ingvar grant for Future Research leaders in 2005 from the Swedish Foundation for Strategic Research (SSF) – a six year grant about 9 MSEK. He is also currently holding a Senior Researcher Fellowship from the Swedish Research Council since 2007. He became a tenured associate professor in 2007. He was appointed the Professor of Photonics from November 1, 2009, and thus being the youngest professor in the ICT school of KTH. He has published over 110 journal papers, and his h index is 26 till the Dec. 2009.

报告摘要：
　　贵重金属在纳米光子学中开始起着越来越重要的作用，特别是通过利用贵重金属的表面等离子体效应或者人工电磁介质结构。表面等离子体纳米光子器件能实现光学模的亚波长束缚，因此在超高集成度光路，发光二极管，传感器，探测器等应用中将起着巨大的作用。同时，亚波长金属材料组成的人工电磁介质也能展现出各种激动人心的物理特性和潜在的应用。表面等离子体器件和人工电磁介质结构都需要贵重金属（比如金，银等）作为其基本的组成元素。在本讲座中，我们将回顾我们研究小组最近表面等离子体器件和人工电磁介质结构方面的一些进展。我们将系统介绍光通讯波段的亚波长表面等离子波导和普通硅波导之间的高性能耦合器，以及超薄、宽吸收角度的亚波长人工电磁介质完美吸收结构等。我们也将简单介绍我们在利用表面等离子体效应和人工电磁介质结构的隐形衣方面的一些研究。

仇旻教授1995年获得浙江大学物理学学士学位，1999年获浙江大学凝聚态物理学博士学位。2001年获瑞典皇家工学院电磁理论工学博士学位。同年被聘为瑞典皇家工学院微电子及应用物理系助理教授， 2007年获聘为终身副教授，2009年晋升为终身正教授，是皇家工学院信息通讯学院最年轻的教授。 2005年获得瑞典战略研究基金会的第二届“未来科研带头人”项目资助，为期六年、共计900万瑞典克朗的科研基金。2007年又获得了瑞典国家科学研究基金会“高级研究员” 基金资助，并获得了为期六年、共计约600万瑞典克朗科研资助基金，用于新型微纳器件的制造工艺的研究。已发表SCI论文110余篇，其h指数（h index）至2009年底为26。