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HL: Halbleiterphysik

HL 55: Photonic crystals

HL 55.2: Vortrag

Freitag, 31. März 2006, 11:45–12:00, BEY 154

Dynamics of Optical Wavepackets in Coupled Microcavities — •Markas Sudzius, Vadim G. Lyssenko, Robert Gehlhaar, Marco Swoboda, Michael Hoffmann, and Karl Leo — Institut für Angewandte Photophysik, TU Dresden, D-01062 Dresden, Germany

We investigate the oscillating amplitudes and phases of a 150 fs laser pulse, transmitted through coupled microcavities, using time- and spectrally-resolved cross-correlation techniques. Careful monitoring of the upconverted signal allows the determination of frequencies, amplitudes, damping rates, and relative phases of spectral components of the wavepacket. The experimental observations can be explained by a Fourier-transform-based analytical model, leading to a better understanding of the origin of the temporal and spatial terahertz oscillations (optical Bloch oscillations) and allowing to reconstruct their evolution in coupled microcavities. In particular, we investigate how the real time evolution of the upconverted signal depends on the interplay between central laser wavelength, laser halfwidth and cavity mode splitting. These parameters are of crucial importance for both qualitative and quantitative behavior of the signal.