Experimental modulation depth as a function of the absorbed pump intensity (solid symbols: sample A; open symbols: sample B). Lines: modulation depth computed according to Eq. (14).
Integrated photoinduced absorption, computed according to Eq. (11), for all the pairs obtained from the numerical calculations, plotted against the waveguide experimental photoinduced attenuation. Line: Eq. (12).
PA efficiency (a) and exponent (b) obtained from the numerical simulation, plotted vs the difference between pump energy and energy gap of the samples.
Computed modulation depth as a function of (a) and (b), all other parameters being fixed. The fixed parameters in this calculation were: , , , , , (a) and (b).
Waveguide photoinduced attenuation as a function of total absorbed intensity. Lines: Eq. (12).
Surface photoinduced absorption vs photon flux absorbed at the surface. Lines: result of the numerical fit [Eq. (15) combined with Eq. (16), with ].
Product as a function of (a) the difference between pump energy and energy gap of the samples and (b) the PA efficiency .
PECVD deposition conditions and properties of the guiding layers: silane and methane flow rates, diborate-to-silane ratio R; thickness, Tauc gap, absorption coefficient at the three pump wavelengths used in the experiment. The samples were deposited at 13.56 MHz, , substrate temperature.
Exponent and PA efficiency obtained from the simulation: sample, pump wavelength , exponent , PA efficiency , and efficacy [see Eq. (12)]. The dimensions of are not indicated, as they depend on .
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