Plasmonic enhancement of random lasing from dye-doped polymer with dispersed Au nanoparticles

We report plasmonic enhanced random lasing from dye-doped polymer with dispersed Au nanoparticles (DP@Au NPs). The Au nanoparticles, fabricated by simple and convenient sputtering and thermal annealing processes, are employed as scatterers in a DCJTB-doped PMMA film. Random-arranged and nearly spherical nano-Au particles are fabricated by optimizing the sputtering time and annealing temperature. Multiple scattering coming from particles plays a fundamental role in random lasing emissions. We demonstrate low-threshold random lasing and also the polarization dependence by observing emission as a function of pump beam power and detection polarization in DP@Au NP system. Our findings provide an effective approach for random lasing and could pave a way for the fabrication of efficient random lasing devices.