Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 37: Photonische Kristalle I

HL 37.3: Vortrag

Montag, 7. März 2005, 10:30–10:45, TU P270

Frequency-Selective Modification of the Radiation Pattern of Emitters in Photonic Crystals — •Michael Barth and Frank Cichos — Photonics and Optical Materials, Institute of Physics, Chemnitz University of Technology

We have studied the angle-dependent spontaneous emission of dye molecules in single, highly ordered domains of three-dimensional photonic crystals using a new microscopy setup. A strongly modified radiation pattern has been found for frequencies near the photonic stop band, including a highly directional four-fold intensity enhancement at its high-frequency edge. For the first time, the experimental observations are directly compared to numerical calculations of the angle-dependent local optical density of states. The excellent agreement between experiment and theory suggests, that the angular emission probability of the dye molecules is directly modified by the optical mode structure of the photonic crystal. This leads to a spectral and spatial redistribution of the emitted light without significant change of the radiative lifetime.