Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.5: Poster

Thursday, March 17, 2011, 18:00–21:00, P4

New features about angle-resolved fluorescence microscopy in Photonic Crystals — •Lars Heerklotz, Rebecca Wagner, and Frank Cichos — University of Leipzig, Leipzig, Germany

Periodical spatial variations of a materials properties lead, via the Bloch condition, to the formation of bands, causing partial and total band gaps. That holds for electrons in a semiconductor, where the core potential is periodic, as well as for photons in a Photonic Crystal (PC), where the dielectric constant is periodic. In the photonic case this means, that light can not propagate in the band gap regions. To observe these features we produced face-centered cubic (fcc) PCs by evaporation from a solution of fluorescent dye beads and polystyrene beads, which form the PC. In the past conventional wide field or confocal setups have been used intensively to study the behavior of light sent from many dyes in three dimensional PCs. We are using our home-build novel confocal setup to investigate the behavior of light emitted from single dye beads inside the PC. Advantage, compared to former setups, is the acquisition of spectra for several angles in one measurement. This method, angle resolved fluorescence microscopy, is applied to measure the fractional local density of states for different depths of dyes inside the crystal and to observe the threefold structure in the first Brillouin-zone of the fcc-lattice.