Аннотация:принята к публикации
In this chapter, the nonlinear-optical properties of porous silicon and poroussilicon-
based structures are discussed in close connection with their linear optical
properties. Variations of the nonlinear susceptibility tensor for porous silicon in
comparison with bulk silicon are discussed with special interest to the effect of
optical anisotropy caused by the pore orientation. Phase matching for second- and
third-harmonic generation in birefringent porous silicon and photonic crystals is
also covered. Incoherent nonlinear-optical processes such as nonlinear refraction,
absorption, and optical bleaching, as well as different mechanisms responsible for
them, are reviewed. Finally, the possibility to employ these effects for developing
photonic devices as optical gates, logical elements, and waveguides are
discussed.