Silicon nanophotonics is emerging as a new platform for integration of photonic and electronic devices. Examples on our recent efforts on monolithic light sources in silicon-on-insulator (SOI) are reported. A first example was an active slot waveguide integrated with a photonic crystal (PhC), containing as emitting centers Er-doped Si nanoclusters. Simultaneous inhibition and redistribution of light emission have permitted to obtain an Er 3+ emission enhancement when the involved transition is in resonance with a mode of the ...