Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Poster Session I

HL 44.90: Poster

Dienstag, 15. März 2011, 18:00–21:00, P3

Cavity-photon mode dispersion in 1D confined optically anisotropic microresonators — •Chris Sturm, Helena Hilmer, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig

Microresonators with an anisotropic cavity medium, e.g. GaN and ZnO, became more important in the last years. These structures allow the realization of devices operating in the UV spectral range (e.g. blue LEDs) and the observation of a strong exciton-photon coupling at room temperature and above. For a precise description and understanding of the coupled particles the properties of the involved photons (especially their dispersion) have to be known.

Here we present an approach to the calculation of the cavity-photon dispersion which takes into account the optical anisotropy of the cavity medium as well as the number of layer pairs of the Bragg reflectors which are used as mirrors for the microresonator. Thereby we found, that even for a uniaxial c-plane oriented cavity with a birefringence of 3% (similar to that of ZnO), the influence of the anisotropy on the TE-TM splitting is in the same order of magnitude as the splitting itself. Therefore the anisotropy of the cavity medium cannot be neglected. Furthermore, we applied this model to a ZnO-based microresonator which yields good agreement with the experimentally observed dispersion of the cavity-photon mode.