alexa Aluminum for plasmonics.
Materials Science

Materials Science

Journal of Nanomedicine & Nanotechnology

Author(s): Knight MW, King NS, Liu L, Everitt HO, Nordlander P,

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Abstract Unlike silver and gold, aluminum has material properties that enable strong plasmon resonances spanning much of the visible region of the spectrum and into the ultraviolet. This extended response, combined with its natural abundance, low cost, and amenability to manufacturing processes, makes aluminum a highly promising material for commercial applications. Fabricating Al-based nanostructures whose optical properties correspond with theoretical predictions, however, can be a challenge. In this work, the Al plasmon resonance is observed to be remarkably sensitive to the presence of oxide within the metal. For Al nanodisks, we observe that the energy of the plasmon resonance is determined by, and serves as an optical reporter of, the percentage of oxide present within the Al. This understanding paves the way toward the use of aluminum as a low-cost plasmonic material with properties and potential applications similar to those of the coinage metals. This article was published in ACS Nano and referenced in Journal of Nanomedicine & Nanotechnology

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