Self-Referenced Plasmon Waveguide Resonance Sensor Using Different Waveguide Modes

Figure 7

(a) The comparison of angular reflectance spectra with silica film and MgF₂ film as the dielectric layers. The gold film, silica film, and MgF₂ film have the thickness of 55 nm, 1000 nm, and 1650 nm. The refractive indices of the prism, gold, silica, MgF₂, and water are 1.515, 0.133 + 3.654, 1.46, 1.38, and 1.33, respectively. The incident wavelength is 632.8 nm. (b) The electric field strengths in different waveguide modes under resonance condition are plotted against the distance from the film/water interface.

(a)

(b)