Room Temperature Broadband Polariton Lasing from a Dye‐Filled Microcavity

A material system is proposed to generate polariton lasing at room temperature over a broad spectral range. The system developed is based on a boron‐dipyrromethene fluorescent dye (BODIPY‐G1) that is dispersed into a polystyrene matrix and used as the active layer of a strongly coupled microcavity. It is shown that the BODIPY‐G1 exciton polaritons undergo nonlinear emission over a broad range of exciton–cavity mode detuning in the green‐yellow portion of the visible spectrum, with polariton lasing achieved over a spectral range spanning 33 nm. The recorded linewidth of ≈0.1 nm corresponds to a condensate coherence lifetime of ≈1 ps. It is proposed that similar effects can be anticipated using a range of molecular dyes in the BODIPY family; a result that paves the way for tunable polariton devices over the visible and near‐infrared spectral region. Experimental demonstration of a tunable organic polariton laser in the green‐yellow range of the spectrum, operating at ambient conditions, is presented here. A strongly coupled microcavity, filled with boron dipyrromethene fluorophore dyes, is utilized to realize polariton lasing tunable over 33 nm of the optical spectrum with an ultranarrow linewidth (0.1 nm), paving the way for microdisplay and retinal laser projectors for deep color augmented reality applications.