Structure of the waveguide used for tests. The configuration between pump and probe beams with respect to the sample is schematized.
Modulation depth measurements on the waveguide vs the pump illumination intensity at each pump wavelength. The straight lines are guides for the eye.
Surface photoinduced absorption of the film vs the pump illumination intensity obtained by fitting the experimental data to the simulation of the waveguide propagation. The error bars in the abscissa reflect the 10% error on . The straight lines are guides for the eye.
Surface photoinduced absorption of the film vs photon absorption rate at the surface.
Optical data, thickness and Tauc gap for the film used as waveguide core in the experiment. Quantities , , and were spectrophotometer data, while and at were measured through a single wavelength multiangle ellipsometer.
Results of linear best fits performed for each pump wavelength on the photoinduced absorption data vs the absorbed photon rate per unit volume at the surface according to Eq. (9).
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