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The second- and third-harmonics enhancement in birefringent silicon-based photonic crystals and microcavities at the photonic band gap edge due to fulfilment of phase matching condition is controlled due to anisotropy of porous silicon dielectric function.
Continuous-wave, visible emission from a silica microresonator on silicon by third harmonic generation is demonstrated. Emission is observed with pump powers <300 muW. This result opens the possibility of silicon microphotonic devices spanning from UV to NIR.
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