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Schematic diagram of the experimental waveguide sensor.
Relative absorption spectra of a GaAs waveguide for two different air gaps (The curve for the gap has an offset for clarity).
Transmission spectra for a -thick silicon waveguide. Inset: Blocked prism scheme.
Thickness dependence of resonance frequencies for Si waveguides for different orders.
Frequency shift of the , 4, and 5 transverse TE mode of a -thick GaAs waveguide covered with a layer of oil. The upper trace shows the division of the two spectra where the frequency shift for the waveguide modes is obvious. In contrast there is no frequency shift for the water vapor absorption peak.
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