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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.102: Poster

Montag, 23. März 2009, 14:30–17:00, P2

Modification of emission of internal emitters in Photonic Crystals — •Rebecca Wagner, Sven Zimmermann, and Frank Cichos — Molecular Nanophotonics Group, University of Leipzig, Linnéstraße 5, 04103 Leipzig

In a photonic crystal the dielectric constant varies spatially on the length scale of optical wavelengths which leads to the formation of a photonic band structure. In weak dielectric systems there exist no complete gaps but stop bands for certain directions. This results in a spectral and angular redistribution of the emission of internal emitters.

We use dye beads that are homogeneously distributed within a 3D crystal in a low concentration to locally probe the band structure. The emitters are detected by defocused imaging microscopy. The diffraction patterns show a three-fold symmetry that is connected to the local structure of the crystal. The intensity I(z) of single beads in depth z inside a PC follows the usual Lambert-Beer-law for emission wavelengths outside the band gap. For beads emitting in the band gap there is a modification of the law. The enhanced attenuation is caused by a stop band that inhibits emission into direction of the detection.