Pronounced Linewidth Narrowing of an Aluminum Nanoparticle Plasmon Resonance by Interaction with an Aluminum Metallic Film
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Data publicació2015-09-18
EditorACS
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Abstract
Aluminum nanocrystals and fabricated nanostructures are
emerging as highly promising building blocks for plasmonics in the
visible region of the spectrum. Even at the individual nanocrystal level,
however, the localized plasmons supported by Al nanostructures possess
a surprisingly broad spectral response. We have observed that when an
Al nanocrystal is coupled to an underlying Al film, its dipolar plasmon
resonance linewidth narrows remarkably and shows an enhanced
scattering efficiency. This behavior is observable in other plasmonic
metals, such as gold; however, it is far more dramatic in the aluminum
nanoparticle−film system, reducing the dipolar plasmon linewidth by
more than half. A substrate-mediated hybridization of the dipolar and
quadrupolar plasmons of the nanoparticle reduces the radiative losses of the dipolar plasmon. While this is a general effect that
applies to all metallic nanoparticle−film systems, this finding specifically provides a new mechanism for narrowing plasmon
resonances in aluminum-based systems, quite possibly expanding the potential of Al-based plasmonics in real-world applications
ISSN1530-6984
Versió de l'editorhttp://pubs.acs.org/doi/full/10.1021/acs.nanolett.5b02883
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Fitxers | Descripció | Mida | Format | Visualitza |
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acs%2Enanolett%2E5b02883.pdf | 1,873Mb | Accés restringit |