Abstract: High reflectivity of surface plasmon polaritons (SPPs) is realized using an antisymmetrical semi-infinite dielectric-metal structure. The authors present a theoretical treatment of the reflection and transmission of normal and oblique incident SPPs at the antisymmetrical semi-infinite dielectric-metal structure respectively. The electromagnetic field is expressed in terms of complete sets of discrete eigenmodes by limiting the thickness of the dielectric, and the reflection and transmission coefficients matrix are obtained according to the matching condition of the tangential fields. When the thickness of the dielectric approaches to infinity, the approximate analytical expressions are consistent with the digital solutions perfectly. The effect of incident angle to the reflectivity and transmittance of oblique incident SPPs is also analyzed.

Key words: surface plasmon polaritons, antisymmetrical semi-infinite dielectric-metal structure, dispersion relation, reflectivity, transmittance

摘要： 利用反对称半无限介质-金属结构实现了表面等离激元的高反射率。计算了反对称半无限金属-介质结构中正入射和斜入射表面等离激元的反射和透射。限制介质的厚度, 将电磁场表示成各离散本征模式的叠加, 根据边界条件得到反射系数和透射系数矩阵。 介质厚度趋于无穷时, 得到反对称半无限介质-金属结构中表面等离激元反射系数和透射系数的近似解析表达式, 计算结果与数值解相吻合。最后分析了斜入射表面等离激元的反射率和透射率与入射角的关系。

关键词: 表面等离激元, 反对称半无限介质-金属结构, 色散关系, 反射率, 透射率