Sub-microwatt direct laser writing of fluorescent gold nanoclusters in polymer films
Bitarafan, Mohammad H.; Suomala, Sofia; Toivonen, Juha (2020)
Bitarafan, Mohammad H.
Suomala, Sofia
Toivonen, Juha
2020
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202010207406
https://urn.fi/URN:NBN:fi:tuni-202010207406
Kuvaus
Peer reviewed
Tiivistelmä
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.
Kokoelmat
- TUNICRIS-julkaisut [16977]