Journal
SCIENCE
Volume 358, Issue 6363, Pages 640-644Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan8478
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Funding
- Spanish MINECO(Ministry of Economy and Competitiveness) [CTQ2012-37404-C02-01, MAT2013-46101-R, MAT2014-59678-R, ENE2015-70300-C3-3-R, CTQ2015-65033-P]
- EUROfusion Consortium [AWP15-ENR-01/CEA-02]
- Madrid Regional Government [S2013/MIT-2775, S2013/MIT-2807]
- European Research Council (ERC) [267867]
- Madrid Regional Government
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The irradiation of gold nanorod colloids with a femtosecond laser can be tuned to induce controlled nanorod reshaping, yielding colloids with exceptionally narrow localized surface plasmon resonance bands. The process relies on a regime characterized by a gentle multishot reduction of the aspect ratio, whereas the rod shape and volume are barely affected. Successful reshaping can only occur within a narrow window of the heat dissipation rate: Low cooling rates lead to drastic morphological changes, and fast cooling has nearly no effect. Hence, a delicate balance must be achieved between irradiation fluence and surface density of the surfactant on the nanorods. This perfection process is appealing because it provides a simple, fast, reproducible, and scalable route toward gold nanorods with an optical response of exceptional quality, near the theoretical limit.
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