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Suppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state
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2016 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 24, no 23, 26851-26856 p.Article in journal (Refereed) Published
Abstract [en]

Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electron-phonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles.

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2016. Vol. 24, no 23, 26851-26856 p.
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-198572DOI: 10.1364/OE.24.026851ISI: 000388414600085PubMedID: 27857413OAI: diva2:1057724

QC 20161219

Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2016-12-19Bibliographically approved

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