Exciton-polaritons in a ZnO-based microcavity: polarization dependence and nonlinear occupation

Details Exciton-polaritons in a ZnO-based microcavity: polarization dependence and nonlinear occupation Exciton-polaritons in a ZnO-based microcavity: polarization dependence and nonlinear occupation

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13c3014s&link_type=abstract

New Journal of Physics, Volume 13, Issue 3, pp. 033014 (2011).

Physics

4

Scientific paper

We report on the occupation of the lower exciton-polariton branch in a ZnO-based microcavity as a function of the detuning between the exciton and the uncoupled cavity-photon mode and on the optical excitation density. We emphasize the difference in the dispersion and occupation of the lower polariton branch as a function of the linear polarization of the emitted light. For the negative detuning regime, we found an energy splitting between the transverse electric (TE)- and transverse magnetic (TM)-polarized states at in-plane wave vectors between 0.4×107 m-1 and 1.2×107 m-1, which is caused by the polarization dependence of the dispersion of the uncoupled cavity-photon mode. The maximum energy splitting of about 6 meV was observed for a detuning of about Δ=-70 meV. From the integrated photoluminescence peak, we deduce the occupation of the lower polariton branch as well as the scattering rates of exciton-polaritons into the lower polariton branch. We found that the energy splitting causes an enhanced scattering of exciton-polaritons into the lower polariton branch for the TM-polarized light compared with that of the TE-polarized light. By varying the excitation density, we observe a superlinear growth of the lower polariton branch occupation for negative and intermediate detuning regimes. For an accumulation of exciton-polaritons in the ground state at low temperatures (T=10 K), we found an intermediate detuning regime (-20 meV<Δ<+20 meV) as the optimum. With increasing temperature, this optimum detuning range shifts to larger negative values.

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