Exciton-Polaritons in Hybrid Inorganic-organic Perovskite Fabry-P\'erot Microcavity

TL;DR

This paper demonstrates room temperature strong exciton-photon coupling in hybrid inorganic-organic perovskite microcavities, enabling potential applications in polariton-based light sources and nonlinear optics.

Contribution

First demonstration of room temperature photon-exciton strong coupling in hybrid perovskite Fabry-Pérot microcavities with high vacuum Rabi splitting.

Findings

Vacuum Rabi splitting energy up to ~390 meV

Strong coupling occurs at room temperature in hybrid perovskite microcavities

Carrier screening effect leads to photonic lasing instead of polariton lasing at higher pump energies

Abstract

Exciton-polaritons in semiconductor microcavities generate fascinating effects such as long-range spatial coherence and Bose-Einstein Condensation (BEC), which are attractive for their potential use in low threshold lasers, vortices and slowing light, etc. However, currently most of exciton-polariton effects either occur at cryogenic temperature or rely on expensive cavity fabrication procedures. Further exploring new semiconductor microcavities with stronger exciton photon interaction strength is extensively needed. Herein, we demonstrate room temperature photon exciton strong coupling in hybrid inorganic-organic CH3NH3PbBr3 Fabry-P\'erot microcavities for the first time. The vacuum Rabi splitting energy is up to ~390 meV, which is ascribed to large oscillator strength and photon confinement in reduced dimension of optical microcavities. With increasing pumping energy, exciton-photon coupling strength is weakened due to carrier screening effect, leading to occurrence of photonic lasing instead of polartion lasing. The demonstrated strong coupling between photons and excitons in perovskite microcavities would be helpful for development of high performance polariton-based incoherent and coherent light sources, nonlinear optics, and slow light applications.