3 November 2016 Surface plasmon resonance scattered by a dielectric sphere
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Abstract
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.
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Xin Hong, Xuejie Yin, "Surface plasmon resonance scattered by a dielectric sphere", Proc. SPIE 10028, Plasmonics II, 1002815 (3 November 2016); doi: 10.1117/12.2244503; https://doi.org/10.1117/12.2244503
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