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Sub-microwatt direct laser writing of fluorescent gold nanoclusters in polymer films

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)138-148
Number of pages11
JournalOptical Materials Express
Issue number1
Publication statusPublished - 2020
Publication typeA1 Journal article-refereed


We report on the micro-pattering of fluorescent gold nanoclusters embedded in polyvinyl alcohol film using a low-cost continuous-wave laser. We show that the formation of gold nanoclusters requires low-level laser irradiation (<100 W/cm2), corresponding to a sub-microwatt focused beam. This low-intensity requirement enables substantially higher speed and cost-effective light patterning process. As a result of using only small intensities during gold nanoclusters production, no microscopic topological changes were observed in the polymer film. This class of gold nanoclusters potentially finds application in high-speed authenticity marking and similar labeling applications.

Publication forum classification

Field of science, Statistics Finland