力学系与湍流国家重点实验室学术报告4.20
发布时间: 2010-04-13 12:30:00
SEMINAR SERIES
北京大学工学院 ![]()
力学与空天技术系
力学与空天技术系 湍流与复杂系统国家重点实验室
题目：Interfacial operator approach to computing eigenmodes for plasmonic crystals
报告人 Chien-Cheng Chang
Taiwan University and Academia Sinica
报告内容摘要：
It has been difficult to compute eigenmodes for photonic crystals with metallic components included in the periodic units. The existence of surface plasmon modes presents the major difficulty not only because of the localized nature of the modes but also of the apparent necessity of handling a nonlinear eigenvalue problem. In this talk, we show that by introducing an interfacial operator in the finite-difference framework, the problem for computing surface plasmon modes can be formulated in the format of standard eigenvalue problems. The key element of the approach is an interfacial variable introduced along the interface between the metal and the surrounding dielectric material, which represents the local strength of the surface phonon modes along the interface. The eigenmodes can be computed directly without the need of examining transmission spectra as in the finite-difference time-domain method, or locating the mode frequency by testing an auxiliary function in other methods. The method will first be described with the free-electron model for one and two-dimensional arrays, and then generalized in a different setting to waveguide problems for plasmonic crystals in which the dielectric function of the metallic components can be arbitrary in frequency.
主持人：王建祥 教授
时 间：4月20日（周二）下午3:00
地 点：力学楼434会议室
欢迎广大师生光临！
联系人：刘剑飞 62758899