Ultrafast Optical Properties of Cavity-Enhanced Superfluorescence

Cavity-enhanced superfluorescence is an ultrafast and intense lasing produced by strong interaction between superfluorescence and optical cavity. However, due to the quite difficulty of particle cooperative emission in solid-state systems, and the low coupling efficiency between superfluorescence and optical cavity, research on ultrafast optical properties of cavity-enhanced superfluorescence is thus far in its infancy. Fortunately, perovskites being made into quantum dot superlattice microcavity is an excellent candidate as such light source. This work reveals the time-dependent redshift process of cavity-enhanced superfluorescence under high-power injection, and interprets the physical mechanism of lasing broadening with increasing power from the dynamic perspective. At the same time, the multi-mode lasing dynamic photoluminescence image output at different times is also tracked. The short-wavelength resonance mode has a lower stimulated threshold, but its radiation lags behind the long-wavelength resonance mode by 4 ps in high excited density. These ultrafast optical property researches may promote the application of quantum dot superlattices in information technology, optical communications, ultrafast lasers, and other fields.