Localized surface plasmon resonances after selective oxidization of AuCu solid solution nanocrystalline films

doi:https://doi.org/10.1063/1.4926333

Localized surface plasmon resonances after selective oxidization of AuCu solid solution nanocrystalline films

Andreas Sousanis,Spyridon Grammatikopoulos,A. Delimitis,V. Dracopoulos,P. Poulopoulos-2015-07-06-Applied Physics Letters

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TL;DRAbstract

AuxCu100−x, 4 ≤ x ≤ 12 at.%, solid solution nanocrystalline films with thickness between 1.5 and 100 nm were grown on Si(100) and Corning glass substrates at room temperature by radio frequency magnetron sputtering. After post annealing at 430 °C in a furnace with air, phase separation occurred between CuO and Au. The Au nanoparticles showed intense localized surface plasmon resonances with an amplitude increasing with Au concentration. We show the evolution of these resonances with the annealing time and correlate the structure to optical properties. The controllable tuning of position and intensity of plasmon resonances render this system a good candidate for applications.

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AuxCu100−x, 4 ≤ x ≤ 12 at.%, solid solution nanocrystalline films with thickness between 1.5 and 100 nm were grown on Si(100) and Corning glass substrates at room temperature by radio frequency magnetron sputtering. After post annealing at 430 °C in a furnace with air, phase separation occurred between CuO and Au. The Au nanoparticles showed intense localized surface plasmon resonances with an amplitude increasing with Au concentration. We show the evolution of these resonances with the annealing time and correlate the structure to optical properties. The controllable tuning of position and intensity of plasmon resonances render this system a good candidate for applications.

Keywords

Nanocrystalline materialAnnealing (glass)Materials scienceSputter depositionPlasmonSurface plasmon resonanceSurface plasmonSputtering

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