报告地点：材料A楼500号

　　报告题目：Cloaking Sound and Light with Metamaterials

　　报告人：Steven A. Cummer，美国杜克大学电气与计算机工程教授。

　　嘉宾简介：

　　Steven A. Cummer教授，本硕博均就读于斯坦福大学，1997年获博士学位，1997-1999国家研究中心博士后，2000年就职于杜克大学。Steven A. Cummer教授的研究跨越了应用电磁学和波传播等不同方向，具体包括电磁超材料、声学超材料、电磁和声学隐身、闪电和高空效果、上层大气遥感、空间和行星物理学，均取得卓越建树。

　　1999年获国际无线电科学联合会（URSI）年轻科学家奖，2001年获科学家和工程师总统早期职业奖（PECASE），2009年获普拉特工程学士学位和马里昂麦克唐纳奖教学与研究卓越奖，2011年当选电气和电子工程师协会（IEEE）会士，2016年当选美国地球物理联盟（AGU）会士。迄今为止多次担任包括IEEE International Symposium on Antennas and Propagation等在类的顶尖国际学术会议的组织者或主席，以及60余次大会邀请报告。发表包括Science, Nature及其子刊, PNAS, Physical Review Letters在内文章两百余篇，被引12000余次，其中“Metamaterial electromagnetic cloak at microwave frequencies”（ SCIENCE， 314  （5801 ）：977-980 ，2006）被引超过3300次。

　　报告简介:

　　Invisibility has been solely the domain of science fiction for more than a century.  However, it was discovered 10 years ago that there is a solution to this problem lurking in classical wave propagation theory. Work led by Prof. Sir John Pendry showed that electromagnetic wave scattering from an object can, in theory, be eliminated by surrounding it with a shell with the right electromagnetic material properties.  Moreover, despite initial suggestions to the contrary, several groups (including mine) have shown how this concept can be extended to sound waves and other types of waves as well.  I will describe the coordinate-transformation theory behind these solutions, the challenges in designing and fabricating the artificial materials (or metamaterials) that have the necessary but unusual properties, our experimental demonstrations of both electromagnetic and acoustic cloaking that helped prove that the concept is feasible, and the practical difficulties (some of which are severe) that must be solved before this idea can yield devices or materials that achieve what most people think of as invisibility.