Subwavelength-scale lasing perovskite with ultrahigh Purcell enhancement

The remarkable photophysical properties of halide perovskites have led to high-performance lasers. The slow emission dynamics and diffraction-limited device, however, impose an intrinsic barrier on realizing ultrafast and compact lasers for integrated optoelectronic applications. Plasmonic cavities have been employed to reduce laser size. Yet the emission dynamics is fundamentally limited due to the dilemma between ever-reduced cavity size and the increase of losses. Here, we show a subwavelength-scale lasing perovskite with ultrahigh Purcell enhancement of 209 that greatly enhances emission dynamics under ambient conditions. The hybrid surface plasmon polaritons (SPPs) coupled with perovskites significantly reduce plasmonic and trap state loss channels and promote a strong Purcell effect. Moreover, the realization of SPPs confinement away from the perovskite region mitigates gain degradations that enables superior long-term device stability and reliability. Our study opens a new avenue for on-chip ultrafast optoelectronics and fundamental studies of light-matter interactions at the strongly confined field.

Automated summary

Halide perovskites possess remarkable photophysical properties that have led to high-performance lasers, but challenges in emission dynamics and laser size reduction remain. Plasmonic cavities have been used to address these challenges, but limitations still exist due to the trade-off between cavity size reduction and increased losses. The hybrid surface plasmon polaritons (SPPs) coupled with perovskites have shown to significantly reduce loss channels and enhance emission dynamics, paving the way for on-chip ultrafast optoelectronics.