Plasmonic Random Laser Based on Deformed Double Metallic Core Shell NPs

Abstract

In this study, the production and characterization of silver, core-shell gold-silver and core-shell silver-gold nanoparticles, as well as the effect of a random laser with Rhodamine 6G gain medium by applying an external voltage, were investigated. These plasmonic nanoparticles were produced by laser ablation in liquid and pumped with 532 nm nanosecond pulse laser. By increasing the pumping energy above the threshold, the fluorescence spectrum of the plasmonic nanoparticle is amplified. Based on the results, narrow peaks emerged with a full width at half maximum less than 10 nm, with the number of spikes increased with FWHM about (0.42 and 0.34 nm) for Ag@Au NPs and Ag*@Au NSs, which is suitable for the manufacturing of compact and miniaturized random laser sources.