(a)
(b)
Figure 8: (a) Detail of the transmission spectra in the wavelength region where the shift is observed ( device); (b) signal maxima intensities (black squares) and their respective wavelength position values (red squares) for each SV concentration ( device). The error bars represent the standard deviation of blank measurements and wavelength shifts are taking into account resolution of the spectrometer ±0.25 nm and ±70 counts for intensity measurements.