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Random lasing occurs as the result of a coherent optical feedback frommultiple scattering centers. Here, we demonstrate that plasmonic gold nanostarsare efficient light scattering centers, exhibiting strong field enhancement attheir nanotips, which assists a very narrow bandwidth and highly amplifiedcoherent random lasing with a low lasing threshold. First, by embeddingplasmonic gold nanostars in a rhodamine 6G dye gain medium, we observe a seriesof very narrow random lasing peaks with full-width at half-maximum ~ 0.8 nm. Incontrast, free rhodamine 6G dye molecules exhibit only a single amplifiedspontaneous emission peak with a broader linewidth of 6 nm. The lasingthreshold for the dye with gold nanostars is two times lower than that for afree dye. Furthermore, by coating the tip of a single-mode optical fiber withgold nanostars, we demonstrate a collection of random lasing signal through thefiber that can be easily guided and analyzed. Time-resolved measurements show asignificant increase in the emission rate above the lasing threshold,indicating a stimulated emission process. Our study provides a method forgenerating random lasing in the nanoscale with low threshold values that can beeasily collected and guided, which promise a range of potential applications inremote sensing, information processing, and on-chip coherent light sources.

Plasmonic random laser on an optical fiber tip