时间：9月15日（星期五）9：00-10:00

地点：仓前校区勤园20-518

报告摘要：

It was generally assumed that the Stokes parameters are complete characterization for the state of polarization of a plane light wave so that their counterparts in quantum optics, called the Stokes operators, represent the polarization of photons. Here we show, through analyzing the properties of polarized plane waves in an optically active medium, that the Stokes parameters are not able to completely characterize the state of polarization of a plane wave. The key point is that only when a plane wave is expanded in terms of the orthogonal base modes, which are physically meaningful, can the two expansion coefficients make up the Jones vector. Taking this into consideration, we demonstrate that the Stokes parameters of any elliptically polarized wave in an isotropic chiral medium, determined solely by its Jones vector, are transmitted unchanged. They are not able to reflect the rotation of its polarization ellipse along with the propagation. The relationship of the Stokes parameters with the polarization of light needs further investigation.

个人简介：

李春芳，上海大学物理学教授，博士生导师，入选中科院“百人计划”和上海市“领军人才”。1987年和1993年分别获得中科院西安光机所理学硕士和博士学位，1994-5年在中国科技大学物理系做博士后研究。1995年底开始在上海大学从事教学和科研工作，历任物理系常务副主任、研究生部副主任和学科办副主任。先后承担过国家自然科学基金、中科院知识创新工程、上海市启明星及其跟踪等重要研究课题。在隧穿时间的Hartman效应、光束的Goos-Hänchen效应、Imbert-Fedorov效应、矢量光束表示和光学角动量等方面做出了一定的贡献，得到国内外同行的关注和实验验证。目前主要从事光子方程、光的偏振及其自旋方面的研究，在国内外学术期刊发表研究论文120余篇。