Research / 2019 / Article / Fig 5

Research Article

Quantitative Surface Plasmon Interferometry via Upconversion Photoluminescence Mapping

Figure 5

Response to streptavidin and prostate-specific antigen (PSA) of different concentrations for specifically modified Au-UCNP sensors. (a) Normalized intensity distribution of the interference fringes acquired in air after immersing the biotinylated Au-UCNP pattern in streptavidin solution of different concentrations. (b) Variation of (in air) versus streptavidin concentrations for the biotinylated Au-UCNP pattern in panel (a). (c) Normalized intensity distribution of the 10th interference fringe acquired in situ when the biotinylated Au-UCNP pattern is immersed in streptavidin solution of different concentrations. (d) Variation of (in solution) versus streptavidin concentrations for the biotinylated Au-UCNP pattern in panel (c). (e) Normalized intensity distribution of the interference fringes dispersed along the -direction acquired in N2 after the antibody-modified Au-UCNP sensor is exposed to PSA solution of different concentrations. (f) Variation of versus PSA concentrations for the antibody-modified Au pattern.