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HL: Halbleiterphysik

HL 62: Photonische Kristalle IV

HL 62.10: Talk

Wednesday, March 9, 2005, 13:00–13:15, TU P164

Nonlinear optical tuning demonstrated on 2D photonic crystals — •Stefan L. Schweizer¹, Ralf B. Wehrspohn¹, Hong W. Tan², Henry M. van Driel², and Ulrich Gösele³ — ¹Dept. Physik, Universität Paderborn — ²Dept. of Physics, University of Toronto — ³Max-Planck-Institut für Mikrostrukturphysik, Halle

Optical switching can be achieved by changing the refractive index. For this nonlinear optical effects are used. We used pump and probe reflectivity experiments with 130fs laser pulses. Both the Kerr effect and the Drude effect shifting the band edges of a stop gap of a photonic crystal are identified. The Drude effect (based on real carriers) shows a fast rise time but a slow fall time whereas the Kerr effect (virtual carrier excitation) has a very fast rise and fall response. On the other hand the Kerr effect is limited to high pump light intensities.