Kampfrath, TobiasBeggs, D. M.White, ThomasBurresi, M.van Oosten, D.Krauss, T. F.Kuipers, L.2015-09-252015-09-250003-6951http://hdl.handle.net/1885/15711We demonstrate that two coupled photonic-crystal waveguides can route two subsequently arriving light pulses to different output ports even though the pulses are only 3 ps apart. This rerouting of light is due to an ultrafast shift in the transmittance spectrum triggered by the generation of electrons and holes in the Si base material by a femtosecond laser pulse. The use of slow-light modes allows for a coupler length of only 5.2 μm. Since these modes are not directly involved, the 3 ps dead time is solely determined by the duration of the input pulse rather than its transit time through the device.We acknowledge funding through the EU FP6-FET “SPLASH” project. This work is also part of the research program of FOM, which is financially supported by the NWO.http://www.sherpa.ac.uk/romeo/issn/0003-6951..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 25/09/15). Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (Kampfrath, T., et al. "Ultrafast rerouting of light via slow modes in a nanophotonic directional coupler." Applied Physics Letters 94.24 (2009): 241119.) and may be found at https://doi.org/10.1063/1.3153989Keywords: Base material; Dead time; Electrons and holes; Femtosecond laser pulse; Input pulse; Light pulse; Output ports; Photonic crystal waveguide; Slow light; Slow mode; Transit time; Transmittance spectra; Ultra-fast; Nanophotonics; Semiconducting silicon compo2009-06-1910.1063/1.31539892016-02-24