题目：Photonic Band Gap Materials: Light Trapping Crystals
报告人：Prof. Sajeev John （Department of Physics, University of Toronto, Canada）
摘要：
Photonic Band Gap (PBG) materials are artificial, periodic, dielectrics that enable engineering of the most fundamental properties of electromagnetic waves. These include the laws of refraction, diffraction, and spontaneous emission of light. Unlike traditional semiconductors that rely on the propagation of electrons through an atomic lattice, PBG materials execute their novel functions through selective trapping or “localization of light”. This is a fundamentally new and largely unexplored property of Maxwell’s equations. This is also of practical importance for all optical communications, information processing, efficient lighting, and solar energy trapping.
Three dimensional (3D) PBG materials offer a unique opportunity to simultaneously (i) synthesize micron-scale 3D circuits of light that do not suffer from diffractive losses and (ii) engineer the electromagnetic vacuum density of states in this 3D optical micro-chip. This combined capability opens a new frontier in integrated optics as well as the basic science of radiation-matter interactions. I review recent approaches to micro-fabrication of photonic crystals with a large 3D PBG centered near 1.5 microns. These include direct laser-writing techniques, holographic lithography, and a newly invented optical phase mask lithography.
Prof. Sajeev John 简介：
Sajeev John is a “University Professor” at the University of Toronto and Government of Canada Research Chair holder. He co-invented (1987) the concept of photonic band gap materials, providing a systematic route to his original conception (1984) of the localization of light. Professor John is the winner of the 2001 King Faisal International Prize in Science, which he shared with C. N. Yang，the winner of the Institute of Electrical and Electronics Engineers (IEEE) LEOS International Quantum Electronics Award in 2007 for “the invention and development of light-trapping crystals and elucidation of their properties and applications”， as well as the winner of the 2008 IEEE Nanotechnology Pioneer Award. Prof. John has been awarded the Guggenheim Fellowship (USA), the Humboldt Senior Scientist Award (Germany), and the C.V. Raman Chair Professorship of the Indian Academy of Sciences. Prof. John is a Fellow of the American Physical Society, the Optical Society of America, the Royal Society of Canada, and a member of the Max-Planck Society of Germany.
时间：2009年12月25日（星期五）下午3：00
地点：中科院物理研究所B楼二段402会议室
联系人：李志远 研究员 （Tel：82648106）
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
