金属椭圆表面等离子体波导传输特性研究  

Propagation characteristics of surface plasmonic waveguide with metalic elliptical

作　　者：吴博雯 黄志祥[1] 王丽华[1] 吴先良[1] WU Bowen, HUANG Zhixiang, WANG Lihua, WU Xianliang(School of Electronic and Information Engineering, Anhui University, Hefei 230601, China)

机构地区：[1]安徽大学电子信息工程学院,安徽合肥230601

出　　处：《量子电子学报》2018年第2期252-256,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金;51277001;61471001;教育部新世纪优秀人才基金;NCET-12-0596;校科研机构专项资助;2015JG01~~

摘　　要：设计了一种高折射率基底的椭圆表面等离子体波导,基于有限元法对此波导支持的基模的能流密度分布、有效折射率、传播长度、有效面积与几何参数、结构之间的关系进行了分析.能流密度分布表明能量主要集中分布在两个金属椭圆柱之间的中心区域,在金属与锗基底、基底与基底之间也存在能量.通过调节两个椭圆的中心距离及其两个半轴的大小,可以实现此波导模式传输特性的分析。工作波长确定时有效折射率随中心距的增大而减小,而传播长度增大。An elliptical surface plasmonic waveguide with a high refractive index substrate is designed. Dependences of energy flux density distribution, effective refractive index, propagation length, effective area of the fundamental mode supported by the waveguide on the geometrical parameters and structure are analyzed based on the finite element method. The energy density distribution shows that the energy is mainly distributed in the central region between two metallic elliptical cylinders, and there is also energy between the metal and germaniuln substrate, the substrate and substrate. Propagation characteristics of the waveguide mode can be analyzed by adjusting the centric distance of two ellipses and size of two semiaxis. With constant working wavelength, the effective refractive index decreases with increasing of center distance, while the propagation length increases.

关 键 词：纤维与波导光学 金属椭圆 表面等离子体波导 有效折射率 传播长度 

分 类 号：TN928[电子电信—通信与信息系统]