Beggs, Daryl M.; Kampfrath, Tobias; Burresi, M; van Oosten, D.; White, Thomas; O'Faolain, Liam; Krauss, Thomas F; Kuipers, L (Kobus)
We demonstrate a silicon optical switch that can reroute optical signals within a switching time of just 3 ps. The switch is based on photonic crystal waveguides in a directional coupler geometry. The dispersion of the device has been engineered to provide slow-light enhancement, which allows the switching length of the device to be just 5 p.m. The 3 ps switching time is demonstrated using freecarriers in the silicon generated by the absorption of a femtosecond laser pulse.
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