Abstract
Si nanocrystals in silica are attractive for photonic applications. Various optical functions can be realized in this way (for example, light emission). The optical and structural properties of a variety of such materials are described and compared here. It is found that Si nanocrystals with diameters 3-4 nm are not a direct source of the 1.5-eV photoluminescence. Furnace annealing at temperatures up to 1200°C does not complete the Si-SiO2 phase separation, and the suboxide phase and very small Si clusters should be accounted for when discussing light-emission mechanisms. Laser-induced thermal effects on optical and structural properties of free-standing films are described in detail. Laser annealing produces macroscopic Si-SiO2 phase separation and compressive stress on Si nanocrystals. The laser-induced structural changes offer an approach to optical memory with a high data density and superior thermal stability.
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