The arbitrary control of electromagnetic (EM) waves is a key aim of photonic research. Conventional optical materials have limited abilities to manipulate EM waves due to their limited variation ranges of material parameters. Metasurfaces are ultra-thin inhomogeneous metamaterials composed by artificial deep-subwavelength planar meta-atoms arranged in specific macroscopic orders, and were found to exhibit extraordinary capabilities to control EM waves leading to many fascinating phenomena such as anomalous refraction/reflection, planar-lens focusing and optical vortex generalizations. In this talk, I will briefly review our recent efforts, both theoretically and experimentally, in employing meta-surfaces to control EM waves in various aspects. In particular, I will describe how to convert a propagating wave to a bounded surface wave with very high efficiency based on gradient meta-surfaces, and how to realize full-range active phase modulations using graphene-based meta-surfaces.

报告人简介: 周磊，1988年进入复旦大学，历经本科、硕士、博士阶段于1997年获博士学位。 1997-2000，在日本仙台东北大学金属材料研究所从事博士后研究；2000-2004，在香港科技大学物理系做访问学者；2004 年9 月通过“复旦大学高层次人才引进计划”加盟复旦大学，任物理系教授。于2007 年获得“国家杰出青年基金”，于2009 年获聘教育部“长江学者奖励计划”特聘教授，2010 年获颁“政府特殊津贴”。自93年开始，在电磁特异介质、磁性等多个领域从事理论及实验研究。共发表论文110余篇，其中包含1 篇Nature Materials，5 篇Phys. Rev. Lett., 2 篇Nano Letters等。单篇他引次数最高500 多次，文章总引用近3000 次。