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We observe experimentally optical bistability enhanced through Fanointerferences in high-Q localized silicon photonic crystal resonances (Q ~30,000 and modal volume ~ 0.98 cubic wavelengths). This phenomenon is analyzedthrough nonlinear coupled-mode formalism, including the interplay of chi(3)effects such as two-photon absorption and related free-carrier dynamics, andoptical Kerr as well as thermal effects and linear losses. Our experimental andtheoretical results demonstrate for the first time Fano-resonance basedbistable states with switching thresholds of 185 micro-Watt and 4.5 fJinternally stored cavity energy (~ 540 fJ consumed energy) in silicon forscalable optical buffering and logic.Comment: 15 pages, 4 figures, accepted by AP

Observation of femtojoule optical bistability involving Fano resonances in high-Q∕Vm silicon photonic crystal nanocavities