Refractive index sensor based on surface-plasmon interference.

@article{Wu2009RefractiveIS,
  title={Refractive index sensor based on surface-plasmon interference.},
  author={Xiaofei Wu and Jiasen Zhang and Jianjun Chen and Chenglong Zhao and Qihuang Gong},
  journal={Optics letters},
  year={2009},
  volume={34 3},
  pages={392-4}
}
We propose a refractive index sensor based on the interference of two surface-plasmon waves on both surfaces of a gold film with a two-slit structure. The phase of the interference was solved, and the dispersion relation of the real part of Au dielectric function was considered. The sensor was performed with NaCl-H2O solutions of different concentrations and exhibited a linear response and a high sensitivity of 4547 nm/RIU (refractive index unit) to the refractive index change. 
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