Figure 3
Measured spectral distribution of the modal attenuation of the hybrid plasmonic mode of the ultrathin film based taper in the case of a predefined analyte (Cargille liquid, na = 1.36 at a wavelength of 589 nm).
The inset shows the measured transmission values (in logarithmic scale) for different stub lengths (length of the analyte column) at resonance (λR = 732 nm). The straight green line is a linear fit to the experimental data (in dB-scale), with the slope corresponding to the modal attenuation of the propagating hybrid plasmonic mode.
