@article{oai:mie-u.repo.nii.ac.jp:02000088,
 author = {Motogaito, Atsushi and Nakamura, Shohei and Miyazaki, Jyun and Miyake, Hideto and Hiramatsu, Kazumasa},
 journal = {Optics Communications},
 month = {Apr},
 note = {application/pdf, We exploit surface-plasmon polaritons (SPPs) at the GaP–Au interface to detect chemical species in high refractive index media and verify the device function by detecting 2,4-dichlorotoluene (C₇H₆C₁₂, n=1.55)and 1-bromonaphthalene (C₁₀H₇Br, n=1.65). The calculated dispersion relationship shows that the SPP excited in GaP by 635 nm light incident at 31.6° is effective for detecting C₇H₆C₁₂. Moreover, we analyze the reflectance as a function of the Au layer thickness and find that the illumination angle at which SPPs are excited is consistent with simulation results. When illuminated at 31.6°, the optical electric field is concentrated and transmitted along the Au–C₇H₆C₁₂ interface. Furthermore, we use the device to detect solvent concentrations of the solutions C₂H₅OH–C₇H₆C₁₂ and C₂H₅OH–C₁₀H₇Br. The SPP-excitation angle increases with increasing concentration of C₇H₆C₁₂ and C₁₀H₇Br. We conclude that chemical species in solutions with an index of refraction less than 1.62 can be detected with this approach. These results suggest that SPPs excited at the GaP–Au interface can be exploited to detect chemical species in high-refractive-index media.},
 pages = {64--68},
 title = {Using surface-plasmon polariton at the GaP-Au interface in order to detect chemical species in high-refractive-index media},
 volume = {341},
 year = {2015}
}