Highperformance plasmonic random laser based on nanogaps in bimetallicporous nanowires

A plasmonicrandom laser is fabricated using gold-silver bimetallic porous nanowires withabundant nanogaps that provide strong feedback or gain channels for coherentlasing from dye molecules. The strong confinement of the nanogaps allowsthe bimetallic porous nanowire-based random laser,which is pumped by ns pulses, to operate with a very low threshold andextremely low concentrations of Rhodamine 6G (as low as 0.067 mM). This random laser can be used as a pump source for another coherentrandom laser based on oxazine. These results provide a basis for studies ofcoherent random lasing pumped by another random laser.