Eur. Phys. J. Appl. Phys. (2016) 74: 30502
https://doi.org/10.1051/epjap/2016160093

Regular Article

Coexistence of strong and weak coupling in ZnO nanowire cavities

¹ Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany
² Institut für Festkörpertheorie und -Optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany

^a e-mail: tom.michalsky@physik.uni-leipzig.de

Received: 2 March 2016
Revised: 12 May 2016
Accepted: 25 May 2016
Published online: 24 June 2016

Abstract

We present a high quality two-dimensional cavity structure based on ZnO nanowires coated with concentrical Bragg reflectors. The spatial mode distribution leads to the simultaneous appearance of the weak and strong coupling regime even at room temperature. Photoluminescence (PL) measurements agree with finite difference time domain (FDTD) simulations. Furthermore the ZnO core nanowires allow for the observation of middle polariton branches between the A- and B-exciton ground state resonances. Further, lasing emission up to room temperature is detected in excitation dependent photoluminescence measurements.