Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Photonics II

Q 53.9: Talk

Thursday, March 11, 2010, 16:00–16:15, F 128

Dynamic silicon photonics in slow light waveguides — •Michel Castellanos, Alexander Petrov, and Manfred Eich — Hamburg University of Technology, Institute of Optical and Electronic Materials.

Theoretical approaches for tunable frequency conversion and time delay of guided light signals in Silicon-on-Insulator (SOI) line-defect waveguides are presented. The band structure of a guided mode in such a waveguide can be manipulated by properly modifying the refractive index of the bulk material. By doing so, while a light signal is present in the device (dynamic process), its properties can be manipulated accordingly. Thus a time delay of broadband signals can be achieved by dynamic flattening of the band structure, which corresponds to a dynamic tuning of the signal's group velocity towards zero. Wavelength conversion is achieved by shifting the frequency position of the band structure while its shape is conserved. A combination of slow light signal and guided fast light pump waves is investigated for ultrafast switching through free carriers generation by two photon absorption of the pump wave.