报告人：陈云天

时间：2016年4月20日（周三）14:00-15:00

地点：LE523会议室

报告人简介：

华中科技大学副教授。2005年本科毕业于天津大学，2007年获得瑞典皇家工学院光子学硕士学位，于2007年至2010年期间在丹麦技术大学攻读博士学位。2011年至2013年丹麦技术大学开展博士后研究。2013年9月入职光电学院。

摘要：

In the presence of loss and gain, the coupled mode equation on describing the mode hybridization of various waveguides or cavities, or cavities coupled to waveguides becomes intrinsically non-Hermitian. In such non-Hermitian waveguides, the standard coupled mode theory fails. We generalize the coupled mode theory with a properly defined inner product based on reaction conservation. We apply our theory to the non-Hermitian parity-time symmetric waveguides and cavities, and obtain excellent agreement with results obtained by finite element fullwave simulations. The theory has the strength of studying non-Hermitian optical systems with inclusion of the full vector fields, thus is useful to study and design non-Hermitian devices that support asymmetric and even nonreciprocal light propagations.