Liaoxin Sun

Direct Observation of Whispering Gallery Mode Polaritons and their Dispersion in a ZnO Tapered Microcavity

We report direct observation of the strong exciton-photon coupling in a ZnO tapered whispering gallery (WG) microcavity at room temperature. By scanning excitations along the tapered arm of the ZnO tetrapod using a micro-photoluminescence spectrometer with different polarizations, we observed a transition from the pure WG optical modes in the weak interaction regime to the excitonic polariton in the strong coupling regime. The experimental observations are well described by using the plane wave model including the excitonic polariton dispersion relation. This provides a direct mapping of the polariton dispersion, and thus a comprehensive picture for coupling of different excitons with differently polarized WG modes.

Whispering gallery modes in indium oxide hexagonal microcavities

The work is funded by the NSFC 973 projects and STCSM of China Grant Nos. 2004CB619004 and 2006CB921506. The authors thank the Australian Government Department of Innovation, Industry, Science and Research for funding this collaborative research under the International Science Linkages China Program.

Long lifetime of free excitons in ZnO tetrapod structures

Time-resolved photoluminescence (PL) is employed to characterize optical quality of ZnO tetrapods. PL decay of free excitons (FE) is concluded to contain two components with time constants of 1 and ...

Quasi-whispering gallery modes of exciton-polaritons in a ZnO microrod

We report the photoluminescence (PL) investigations of quasi-whispering gallery mode (quasi-WGM) polaritons in a ZnO microrod at room temperature. By using the confocal micro-PL spectroscopic technique, we observe the clear optical quasi-WGMs. These quasi-WGMs appeared in the ultraviolet (UV) emission region where the cavity modes strongly couple with excitons and form polaritons. The quasi-WGMs polaritons can be well described by the plane wave interference and the coupling oscillator model.

Structural and electronic properties of the in situ impurity As Hg in Hg 0.5 Cd 0.5 Te : First-principles study

The structural and electronic properties of the in situ impurity

Spin-Resolved Purcell Effect in a Quantum Dot Microcavity System

{\mathrm{As}}_{\mathrm{Hg}}

On the origin of suppression of free exciton no-phonon emission in ZnO tetrapods

in

Single-crystalline polyhedral In2O3 vertical Fabry–Pérot resonators

{\mathrm{Hg}}_{0.5}{\mathrm{Cd}}_{0.5}\mathrm{Te}

Polariton lasing in a ZnO microwire above 450 K

(MCT) have been studied by using the density-functional theory within the full-potential linear augmented plane wave method. The supercell with 64 atoms has been considered in the calculations. The relaxation, local charge density, and density of states are shown to discuss the effects of local environment induced by impurity on the electronic structure. The in situ

Robust exciton-polariton effect in a ZnO whispering gallery microcavity at high temperature

{\mathrm{As}}_{\mathrm{Hg}}