Abstract
Amorphous silicon inverse opals with a complete photonic band gap have been studied with optical pump-probe spectroscopy. The pump-generated free carriers cause the reflection near the band gap to be lowered for the first few picoseconds due to induced absorption. After ∼5 ps, this effect disappears and an unexpected blue spectral shift is seen in the photonic band gap. The shift appears consistent with photoinduced stress caused by the thermal expansion mismatch between the silicon and its native oxide. However, simple mechanical models fail to quantify this behavior.
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