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Polarization behavior of the exciton-polariton emission of ZnO-based microresonators

Published online by Cambridge University Press:  31 January 2011

Chris Sturm ,
Helena Hilmer ,
Rüdiger Schmidt-Grund  and
Marius Grundmann
Chris Sturm
Affiliation:
[email protected], Universität Leipzig, Institut für Experimentelle Physik II, Leipzig, Germany
Helena Hilmer
Affiliation:
[email protected], Universität Leipzig, Institut für Experimentelle Physik II, Leipzig, Germany
Rüdiger Schmidt-Grund
Affiliation:
[email protected], Universität Leipzig, Institut für Experimentelle Physik II, Leipzig, Germany
Marius Grundmann
Affiliation:
[email protected], Universität Leipzig, Institut für Experimentelle Physik II, Leipzig, Germany
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Abstract

We present the polarization behavior of the exciton-polariton luminescence of a ZnO-based all-oxide resonator. A splitting in the emission energy between the s- and p-polarized pho-toluminescence of the lower polariton branch was observed which increases with increasing emission angle. It is caused by the polarization behavior of the uncoupled cavity-photon mode, and reaches a maximum of about 5 meV at an emission angle near the bottleneck region. For lar-ger angles the energy splitting decreases. Additionally to the energy splitting, we observed dif-ferences in the photoluminescence intensity which we trace back to different occupation of the lower polariton branch for the two polarizations. Whereas for p-polarization a bottleneck effect is clearly observable, this effect is much weaker for s-polarization. These findings indicate that the relaxation of hot carriers into the bottleneck region is enhanced for the p-polarized photolumi-nescence compared to the s-polarized one. The differences between these two polarizations are most pronounced for a very large negative detuning and vanish with increasing detuning.

Keywords

optical propertiesluminescenceII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1208: Symposium O – Excitons and Plasmon Resonances in Nanostructures II , 2009 , 1208-O18-08
Copyright
Copyright © Materials Research Society 2010

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