Plasmonic enhancement of random lasing from dye-doped polymer with dispersed Au nanoparticles
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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.
We acknowledge the International Cooperation Program for Excellent Lectures of 2017 by Shandong Province Education Department, the National Natural Science Foundation of China (Grant numbers 11874232, 11504194), the Key research and development plan in Shandong Province (Grant number 2018GGX101008), the Natural Science Foundation of Shandong Province, China (Grant number ZR2014FP012), and the Doctoral Found of QUST (Grant number 010022936).