Plasmon-Assisted Random Lasing of Perovskite Materials

Abstract: Random lasing occurs as the result of coherent optical feedback from random scattering centers. Plasmonic nanostructures, such as silver or gold nanoparticles, efficiently scatter light due to the formation of hot spots and optical confinement at the nanoscale. In this work, using silver nanocubes as highly efficient light scattering centers, a broad band plasmon assisted lasing action of halide perovskite materials is demonstrated. By embedding silver nanocubes in CH3NH3PbBr3 and CH3NH3PbI3 solutions, narrow bandwidth lasing modes with a full width at half-maximum of approximately 1 nm are supported. It is observed that the lasing thresholds of perovskites are different for glass and gold substrates, and for different nanocube concentrations. Results of time-resolved measurements indicate a significant shortening in the decay time of the emission at above the lasing threshold, implying a stimulated emission process. The results of this work thus provide a pathway to generate coherent light sources from widely studied perovskite materials.