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Linear transmission spectra of the silicon inverse opal in  direction, as-grown (dashed) and tempered (solid). The dots correspond to the probe wavelengths investigated in Fig. 2. The inset shows an SEM image of the sample surface.
Pump–probe traces for several probe wavelengths (as indicated), vertically displaced for clarity. LHS column: As-grown sample (a-Si), , ; RHS column: Tempered sample (polycrystalline Si), , . All curves in one column are shown on the same scale of transmission relative to the unexcited sample (see arrows). Note the different time scales on the LHS and RHS, respectively.
Calculated transmission for three different parameter sets. The solid curve shows the linear spectrum (i.e., ). The other two curves correspond to an optically excited electron density of and (dashed curve) and (dotted curve), respectively.
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