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Reflective SHG (blue solid squares) measured as a function of the azimuthal angle under four configurations: (a) , (b) , (c) , and (d) . The theoretical calculation curves (red solid lines) show reasonable match with the experimental results. Note that all the curves were normalized for comparison.
Pump power dependent TR-EFISH curves (with offset for clarity). The pump-induced photoexcited carrier density was estimated to be (from the top to the bottom) , , , , , , and , respectively. The inset plots the TR-EFISH minimum position as the function of . The saturation behavior becomes obvious at higher .
TR-EFISH curves of five undoped and Mg-doped samples, whose carrier concentrations were determined to be (A) : , (B) : , (C) : , (D) : , and (E) : , respectively. The photoexcited carrier density was set to to fully screen the field. The inset plots the saturation time as the function of the .
The band bending and carrier distribution of (a) -type and (b) -type are illustrated, where , , IL, , and denote the bulk Fermi level, surface branch point energy, electron inversion layer, free electron, and free hole spatial distributions.
The nonvanishing and tensor elements under some particular SHG configurations.
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