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

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