Stimulated Raman scattering in silicon photonic crystal waveguides under continuous excitation

We experimentally show that doubly resonant cavities formed by very narrow silicon photonic crystal waveguides lead to stimulated Raman scattering at room temperature under continuous excitation. The Raman gain deduced from the measurements agrees with the calculated one. The model, which accounts for stimulated scattering, two-photon absorption and free-carrier absorption, allows us to predict the onset of Raman lasing in silicon photonic crystals.