Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Quantum Effects: Light Scattering and Propagation II / QED I
Q 23.5: Vortrag
Mittwoch, 10. März 2010, 11:45–12:00, A 320
Hemispherical resonators with embedded nanocrystal-quantum-dot-emitters — •Johannes Haase1, Paul Mundra2, Günter Risse4, Susumu Shinohara3, Martina Hentschel3, Hartmut Fröb1, Alexander Eychmüller2, and Karl Leo1 — 1Institut für Angewandte Photophysik, TU-Dresden — 2Physikalische Chemie / Elektrochemie, TU-Dresden — 3Max-Planck-Institut für Physik komplexer Systeme, Dresden — 4Gesellschaft zur Förderung von Medizin-, Bio- und Umwelttechnologien e.V., Dresden
Spherical resonators have the outstanding ability to confine light in three dimensions with comparatively highly quality factors Q as a result of the high efficient total internal reflection. By embedding emitters into those cavities, it is possible to couple their emission to the whispering gallery modes (WGM) of the sphere. The incoupling of excitation light and especially the selective excitation of different regions in the sphere, however, is often a problem. We therefore investigate a new method to produce hemispherical resonators on a distributed Bragg reflector (DBR). Consequently, we have a three dimensional confinement at the emission wavelength and a planar side (the DBR), which is transparent at the excitation wavelength. Thus it is possible to selectively excite emitters in different areas of the hemisphere. We show the preparation of these structures with embedded nanocrystal-quantum-dots (NQD) as emitters. Additionally, we report on the results of micro-photoluminescence measurements of these structures, showing a highly efficient incoupling of NQD emission into WGMs. The modes can be described using a two-dimensional model.