A hybrid perovskite microlaser with an external III-V nanowire-based optical cavity

The trade-off between size, voltage threshold, spectral purity, and manufacturability limits further microlaser development. Metal halide perovskites are considered as a promising material platform for further development of lasing devices. A direct bandgap CsPbBr₃ perovskite offers excellent optical properties for lasing applications; however, it suffers from limited compatibility with photonic integrated circuits due to challenges in precise patterning, integration, and scalability. We demonstrate a hybrid microlaser combining a CsPbBr₃ active layer with an external GaP nanowire-based cavity. In the proposed design, GaP provides high refractive index contrast and low absorption of light emitted by the perovskite. Experimental spectra show sharp amplified spontaneous emission peaks associated with the perovskite film and lasing coupled with the nanowire microcavity. The lasing nature of the emitted light is confirmed by polarisation measurements. Numerical modelling reveals hybrid resonances coupling perovskite-induced exciton-polaritons to the GaP cavity. Based on a low-cost solution process, the suggested approach overcomes perovskite processing limitations and enables reproducible, low-threshold lasing for integrated optoelectronics.