金属包覆平板波导模式特性的有限元法分析  

Theoretical Analysis of the Metal-clad Slab Waveguide Modal Characteristics with Finite Element Method

作　　者：纪磊[1] 于建[1] 薛挺[1] 桑梅[1] 李世忱[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《光电子．激光》2003年第2期131-135,共5页Journal of Optoelectronics·Laser

基　　金：教育部科学技术研究重点资助项目(02042)

摘　　要：采用有限元法(FEM)分析了具有复数折射率的金属包覆介质波导的模折射率与模场分布情况。计算了具有损耗层的6层介质平板波导模折射率,并与解析解比较,二者有较好的一致性;分析了金属包覆3层平板波导中TM模折射率与波导芯层厚度的变化关系;计算了金属包覆5层平板波导中TM模折射率与金属层厚度的变化关系,并结合对模场分布的分析对模式进行了定性判断,给出了其模式演变过程。Modal refractive index and modal field distribution of metalclad slab waveguide with complex refractive index was investigated by exploiting finite element method(FEM).A 6layer waveguide with absorbing layers was analyzed.The comparison of the computational results between finite element methods and analytical method shows good accordance between these two methods.The variation of the modal effective refractive index of TM mode with respect to thickness of the core layer of metalclad 3layer slab waveguide and the variation of the modal effective refractive index of TM mode with respect to thickness of the metal layer for 5layer slab waveguide were calculated.The mode change process was given.

关 键 词：集成光学 光波导 金属包覆 有限元法 折射率 模场分布 

分 类 号：TN256[电子电信—物理电子学]