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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.21: Poster

Tuesday, March 8, 2005, 16:30–19:00, Poster TU F

Spontaneous Emission in Photonic Crystals: Experiment vs. Calculation — •Michael Barth and Frank Cichos — Photonics and Optical Materials, Institute of Physics, Chemnitz University of Technology

We have performed single-domain spectroscopy and time-resolved measurements on dye molecules and CdSe-nanoparticles in three-dimensional photonic crystals. The high spatial resolution of our microscopy setup provides an excellent basis for probing the local optical density of states (LDOS) in these crystals. The measurements are supplemented by corresponding numerical calculations of the LDOS, incorporating anisotropy effects and the spatial distribution of the emitters. It is found experimentally as well as theoretically, that, while the total radiative lifetime may stay nearly unaffected, strong modifications of the radiation pattern can be achieved in certain frequency ranges. We show that these effects depend sensitively on the ordering-quality of the crystal domains and the spatial position of the emitters.