Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 50: Poster II
HL 50.53: Poster
Donnerstag, 30. März 2006, 16:30–19:00, P3
Anisotropic Light Emission of Quantum Dots in Photonic Crystals — •Rebecca Wagner1, Michael Barth2, and Frank Cichos1 — 1Photonics and Optical Materials, Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz — 2Nano-Optics group, Institute of Physics, Humboldt University Berlin, Hausvogteiplatz 5-7, 10117 Berlin
Photonic crystals are periodic dielectric materials, which modify light emission by means of a photonic stop band. In weak photonic systems with low dielectric contrast, the local optical density of states is only modified in certain directions of the photonic crystal therefore giving rise to an anisotropic light propagation. We study the influence of this anisotropic light propagation on the angular emission characteristics of single quantum dots within numerical calculations and experimental investigations. The numerical calculations are based on the fractional local density of states, which describes the angular redistribution of electromagnetic modes in the photonic crystal. The fractional local density of states reveals, that even in weak photonic systems strongly directional emission of emitters may occur, especially at the short wavelength edge of the photonic stop band. This calculation is combined with imaging calculations to compare the results to experimental investigations of anisotropic light propagation using defocused fluorescence wide field imaging on single quantum dots in colloidal photonic crystals.