摘要
从平面电介质-金属薄膜-电介质对称结构中表面等离激元的色散方程出发,建立模型推导得到了同轴电介质-金属薄膜-电介质结构中表面等离激元的色散方程,在这种结构中各阶模式都发生了分裂,形成了高折射率高损耗和低折射率低损耗的两种模式,该模型为理解同轴电介质-金属薄膜-电介质结构表面等离激元模式的传播提供了直观的图像。用色散方程计算了0.5～1.5μm波长范围内各阶模式的等效折射率以及传输损耗,并将该结果与有限元方法数值模拟得到的结果进行对比分析,分析表明,两者吻合得很好。并分析了计算结果以及色散方程的适用范围。
The dispersion relation for coaxial dielectric-metal-dielectric structure by making an explicit connection with the planar dielectric-metal-dielectric structure is obtained.Each mode splits into a high effective refractive index branch and a low effective refractive index branch.An intuitive picture that allows for a qualitative understanding is provided.The effective refractive indexes and propagation losses of the modes are calculated by using the analytical dispersion expression.They fit well with the numerical simulation results obtained by using finite element method in the range of 0.5~1.5 μm.The results the applicability of the dispersion equation are also analyed.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第10期209-213,共5页
Acta Optica Sinica
基金
教育部"新世纪优秀人才支持计划"(NCET-08-0142)资助课题
关键词
表面光学
表面等离激元
长程表面等离子体波
色散关系
有限元法
surfaces optics
surface plasmon polaritons
long-range surface-plasma wave
dispersion relation
finite element method
