Ultrafast plasmonic lasing from metal/semiconductor interface
Until now, plasmonic nanowire lasers mostly adopt hybrid plasmonic waveguides, while nonhybridized plasmonic lasers are lack of study in terms of confinement effect and the corresponding ultrafast dynamics. Here, we report ultrafast plasmonic nanowire lasers composed of a single CH3NH3PbBr3 nanowire on silver film without any insulating layer at room temperature. The nonhybridized plasmonic nanowire lasers exhibit ultrafast lasing dynamics with around 1.9ps decay rate and 1ps peak response time. Such values are among the best ones ever reported. Interestingly, the threshold of the nonhybridized plasmonic nanowire lasers is in the same order as that of hybrid counterparts. The low threshold is due to the ultra-flat single crystal silver films and high-quality single crystal perovskite nanowires. nonhybridized plasmonic lasing in CH3NH3PbBr3 nanowires originates from the stimulated emission of an electron-hole plasma based on our experiments. This work deepens the understanding of nonhybridized plasmonic lasers and paves the way to design electric-pump plasmonic lasers by getting rid of insulating layers.