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论文类型：会议论文

发表时间：2016-10-12

收录刊物：EI、CPCI-S、Scopus

卷号：10028

关键字：evanescent field; dielectric sphere; surface plasmon resonance; Fresnel equation

摘要：It is well known that when total internal reflection occurs at the interface between high to low refractive index, evanescent field will go into the media with low refractive index. This field can be scattered by a small dielectric particle on the surface. In this paper, with the aim to enhance the scattering field we introduced a thin gold film, the filed modified by the metallic film was theoretically calculated by FDTD solver. Further a polystyrene bead at the diameter of 200nm and 800nm was employed to test the model. Theoretical and experimental results agree well with each other that the locally excitated surface plasmon play a dominant role in the field enhancement scattered by the sphere.