Red-green-blue plasmonic random lasing from cascaded polymer slices

Abstract

A red-green-blue (RGB) random laser of cascaded polymer slices with Ag nanoparticles doping is achieved based on a plasmonic feedback mechanism. Three polymer solutions dispersing with silver nanoparticles are sequentially siphoned into a 300 µm capillary tube, with water columns isolating between adjacent polymer ink columns. Next, the plasmonic random laser device of the polymer slices doping with Ag nanoparticles is constructed after the solvents and water evaporated. The Ag nanoparticles show a broad plasmonic resonance spectrum and scatter the pump light in the polymer slices when excited by the pump beam. Therefore, the radiations of the RGB random laser are enhanced and the low-threshold output of the random lasing emits from the micro device. The thresholds are of about 58 µJ cm−2, 151 µJ cm−2 and 47 µJ cm−2, for the red-, green- and blue- components, respectively, and the chromaticity is presented at different angles. This simple and straightforward approach has the potential for the application of compact integrated random laser sources.