Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 27: Photonic crystals III

HL 27.2: Vortrag

Dienstag, 26. Februar 2008, 16:15–16:30, EW 203

Defocused Imaging of Single Emitters in Photonic Crystals — •Rebecca Wagner, Frank Cichos, and Sven Zimmermann — Molecular Nanophotonics Group, University of Leipzig, Linnéstraße 5, 04103 Leipzig

Photonic crystals are materials with a periodically varying dielectric constant. By multiple scattering of light on this spatially modulated refractive index a photonic band structure and photonic band gaps are introduced. Because of the spatial variation of the refractive index the optical density of states inside a photonic crystal is a local property too. Thus a local probe for the study of local optical properties is needed. So far this has only been achieved for 2D photonic structures by means of near field scanning microscopy. We introduce a new technique that uses single emitters inside 3D photonic crystals as probes for its local optical properties. Besides the spectral redistribution of their emission which can be observed in an altered emission spectrum there occurs also an angular redistribution. This anisotropic emission of the embedded emitters can be imaged by defocused fluorescence microscopy since it modifies their defocused imaging patterns. This is shown with extensive calculations and experimental studies. A fitting procedure is introduced to extract the angular dependence of the photonic stop band from the experimental results.