Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 59: Optical Properties II

HL 59.7: Vortrag

Mittwoch, 9. März 2016, 17:00–17:15, H10

Radiative modes in anisotropic planar microcavities — •Steffen Richter, Tom Michalsky, Chris Sturm, Helena Franke, Marius Grundmann, and Rüdiger Schmidt-Grund — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig, Germany

We present dispersions and polarizations of modes in microcavities with optically uniaxial cavity material, as e.g. wide gap oxides.

Using a 4×4 transfer matrix ansatz we compute mode energies and broadenings, i.e. lifetimes, as matrix poles. In contrast to the separation into transversal electric (TE) and transversal magnetic (TM) polarization, which is commonly done for the isotropic case, we can obtain the mode polarizations without any prior restriction. We show that an optical anisotropic cavity material does not change the number of eigenmodes compared with an isotropic one, i.e. two for a λ/2 cavity. Most strikingly, in non-trivial anisotropic configurations the modes are no longer orthogonally polarized to each other but tend both to TM polarization with increasing in-plane wavevectors k_||. Further, for configurations with the propagation direction almost, but not exactly, parallel or perpendicular to the optical axis of the cavity layer, circular polarization contributions of more than 90% can occur at large k_||.