How an oxide shell affects the ultraviolet plasmonic behavior of Ga, Mg, and Al nanostructures

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URI: https://hdl.handle.net/10902/35075
ISSN: 1094-4087
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Autoría
Gutiérrez Vela, YaelAutoridad Unican; Ortiz Márquez, María DoloresAutoridad Unican; Sanz Casado, Juan MarcosAutoridad Unican; Saiz Vega, José MaríaAutoridad Unican; González Fernández, FranciscoAutoridad Unican; Everitt, Henry O.; Moreno Gracia, FernandoAutoridad Unican
Fecha
2016-09
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© 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Publicado en
Optics Express, 2016, 24(18), 20621-20631
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The Optical Society (OSA)
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Resumen/Abstract
The ultraviolet (UV) range presents new challenges for plasmonics, with interesting applications ranging from engineering to biology. In previous research, gallium, aluminum, and magnesium were found to be very promising UV plasmonic metals. However, a native oxide shell surrounds nanostructures of these metals that affects their plasmonic response. Here, through a nanoparticle-oxide core-shell model, we present a detailed electromagnetic analysis of how oxidation alters the UV-plasmonic response of spherical or hemisphere-on-substrate nanostructures made of those metals by analyzing the spectral evolution of two parameters: the absorption efficiency (far-field analysis) and the enhancement of the local intensity averaged over the nanoparticle surface (near-field analysis).
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