title: Refractive index sensor based on surface-plasmon interference.
abstract: 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.
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing, China.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Wu
authors.forename: Jiasen
authors.initials: J
authors.lastname: Zhang
authors.forename: Jianjun
authors.initials: J
authors.lastname: Chen
authors.forename: Chenglong
authors.initials: C
authors.lastname: Zhao
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong