Ultralow threshold polariton laser and vortex formation in an organic microcavity at room temperature

Abstract

Exciton polaritons represent hybrid bosonic quasiparticles that emerge from the strong coupling between excitons and photons. Their distinctive properties provide a robust platform for investigating light–matter interactions. These properties facilitate spontaneous coherence and pronounced nonlinear optical phenomena, making them highly suitable for exploring thresholdless lasing, ultrafast optical switching, and quantum fluid dynamics. Organic semiconductors are especially advantageous for polaritonic applications, owing to their high exciton binding energies and superior processability. In this study, we report a microcavity incorporating DPAVBi plate-like single crystals in a distinct polymorphic phase, achieving a lasing threshold approximately 60 times lower than that of previously reported DPAVBi micro-belts. Furthermore, we demonstrate the emergence of exciton–polariton vortex modes within this organic microcavity at room temperature. Our findings establish a viable pathway for investigating low-power organic photonic lasers and demonstrate their potential utility in quantum information processing and next-generation organic optoelectronic devices.