Nanosecond Photothermal Effects in Plasmonic Nanostructures
2012 (English)In: ACS Nano, ISSN 1936-0851, Vol. 6, no 3, 2550-2557 p.Article in journal (Refereed) Published
Photothermal effects in plasmonic nanostructures have great potentials in applications for photothermal cancer therapy, optical storage, thermo-photovoltaics, etc. However, the transient temperature behavior of a nanoscale material system during an ultrafast photothermal process has rarely been accurately investigated. Here a heat transfer model is constructed to investigate the temporal and spatial variation of temperature in plasmonic gold nanostructures. First, as a benchmark scenario, we study the light-induced heating of a gold nanosphere in water and calculate the relaxation time of the nanosphere excited by a modulated light. Second, we investigate heating and reshaping of gold nanoparticles in a more complex metamaterial absorber structure induced by a nanosecond pulsed light. The model shows that the temperature of the gold nanoparticles can be raised from room temperature to >795 K in just a few nanoseconds with a low light luminance, owing to enhanced light absorption through strong plasmonic resonance. Such quantitative predication of temperature change, which Is otherwise formidable to measure experimentally, can serve as an excellent guideline for designing devices for ultrafast photothermal applications.
Place, publisher, year, edition, pages
2012. Vol. 6, no 3, 2550-2557 p.
thermodynamic, photothermal, metamaterial absorber, nanoparticle reshaping
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-93651DOI: 10.1021/nn2050032ISI: 000301945900071ScopusID: 2-s2.0-84859135597OAI: oai:DiVA.org:kth-93651DiVA: diva2:517452
FunderSwedish Research Council
QC 201204232012-04-232012-04-232014-03-31Bibliographically approved