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Aluminum for plasmonics.

Mark W Knight1, Nicholas S King, Lifei Liu

  • 1Department of Electrical and Computer Engineering, ‡Department of Physics and Astronomy, §Department of Chemistry, and ⊥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States.

ACS Nano
|November 27, 2013
PubMed
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Aluminum nanostructures offer strong plasmon resonances for visible and ultraviolet light. Their optical properties are sensitive to oxide content, enabling aluminum as a low-cost plasmonic material.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Aluminum exhibits unique plasmon resonances across visible and ultraviolet spectra.
  • Its abundance and low cost make it attractive for plasmonic applications, but fabrication challenges exist.
  • Coinage metals like gold and silver are traditional plasmonic materials.

Purpose of the Study:

  • To investigate the sensitivity of aluminum plasmon resonance to oxide presence.
  • To establish aluminum as a viable, low-cost alternative to coinage metals for plasmonics.
  • To demonstrate aluminum nanostructures as optical reporters for oxide concentration.

Main Methods:

  • Fabrication of aluminum nanodisks.
  • Optical characterization of plasmon resonances.

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  • Correlation of resonance energy with oxide percentage.

    • Main Results:

    • Aluminum plasmon resonance energy is highly sensitive to the percentage of oxide within the metal.
    • The plasmon resonance acts as an optical reporter for the oxide content in aluminum nanodisks.
    • Observed plasmonic behavior aligns with theoretical predictions for aluminum nanostructures.

    Conclusions:

    • Aluminum's sensitivity to oxide content can be leveraged for sensing applications.
    • This work validates aluminum as a cost-effective plasmonic material with potential similar to gold and silver.
    • Understanding oxide's role enables precise fabrication of aluminum-based nanostructures for commercial use.