Dispersion mapping of a whispering gallery mode robust polariton at room temperature

Abstract

We report the momentum space dispersion pattern of strong coupling exciton-polaritons with a Rabi splitting (130 meV) in a ZnO self-construct high Q-factor whispering gallery mode (WGM) microcavity at room temperature (RT). By scanning excitations along the c-axis of a microwire (MW) using the angle-resolved spectroscopic technique (ARST) with different polarizations, the evolutions of a WGM polariton in a different coupling regime are investigated comprehensively. In addition, the more exciton-like component at a high k-value dispersion certifies the robust polariton is in SCR. The observations of polariton dispersion are well described by using the coupling wave model. Our results present a direct mapping of the exciton-polariton dispersions based on WGM, and thus supply a feasible road to realize novel polariton-type optoelectronic devices.