题目：Anisotropic Metamaterial for Field Enhancement and Negative Index Applications
报告人：Dr. Michael A. Fiddy（Center for Optoelectronics and Optical Communications，University of North Carolina at Charlotte，USA）
摘要：
Periodic strongly anisotropic structures are predicted to exhibit greatly enhanced resonances at degenerate band edge and split band edge points in the dispersion diagram. Field enhancements of the order of the fourth power of the number of periods are anticipated. We have studied structures meeting these requirements and have exploited form-birefringence in order to realize the anisotropic layers. Microwave experiments have yielded enhancements of the order of X80 with a spatial distribution along the length of the structure. This is in agreement with predictions for the materials being used given their intrinsic absorption losses and the degree of anisotropy. Of great interest is a positive phase delay in the transmitted field that is observed at frequencies close to the band edge at which the large field enhancement occurs. At this frequency, we have also observed large external field emission and an effective negative refractive index provides a plausible explanation for this. We discuss the interpretation of these numerical and experimental results in the context of some potential applications.
Dr. Michael A. Fiddy简介：
Michael Fiddy received his Ph.D in Physics from the University of London in 1977, and was a post-doc in the Department of Electronic and Electrical Engineering at University College London before becoming a tenured faculty member in 1979 at Queen Elizabeth College and then Kings College, London University. Between 1982 and 1987, he held visiting professor positions at the Institute of Optics Rochester and the Catholic University of America in Washington, DC. Dr. Fiddy moved to the University of Massachusetts Lowell in 1987 where he was Electrical and Computer Engineering Department Head from 1994 until 2001. In 2002 he moved to UNC Charlotte to become the founding director of the Center for Optoelectronics and Optical Communications. He was the topical editor for signal and image processing for the J.O.S.A. A from 1994 until 2001 and has been the Editor-in-Chief of the journal Waves in Random and Complex Media (Taylor and Francis) since 1996. He has chaired a number of conferences in his field, and is a fellow of the Optical Society of America, the Institute of Physics and the Society of Photo-Optical Engineers (SPIE). His research interests include inverse problems and optical information processing.
时间：2008年5月22日（星期四）下午4：00
地点：中科院物理研究所B楼Ⅱ402会议室
联系人：吕惠宾 研究员（Tel：82649350）
金奎娟 研究员（Tel：82648099）
主办单位：中国科学院光物理重点实验室
