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Plasmonic dimer antennas for surface enhanced Raman scattering.

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|April 14, 2012
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Summary
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Electron beam induced deposition (EBID) creates 3D gold nanostructures. Coating these with silver enables surface-enhanced Raman scattering (SERS) substrates with enhancement factors up to 10⁴.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optics

Background:

  • Electron beam induced deposition (EBID) enables direct writing of 3D nanostructures.
  • Gold nanocrystals embedded in a carbon matrix are formed using dimethyl-gold(III)-acetylacetonate.
  • Carbon content in EBID deposits limits direct plasmonic applications.

Purpose of the Study:

  • To develop optically active 3D nanostructures for plasmonic applications.
  • To create a reproducible substrate for surface-enhanced Raman scattering (SERS).
  • To investigate the use of silver-coated EBID structures for SERS.

Main Methods:

  • Utilizing EBID with a metal-organic precursor gas (dimethyl-gold(III)-acetylacetonate).
  • Coating EBID-fabricated gold nanostructures with a thin silver layer.
  • Arranging silver-coated nanostructures into dimer antenna arrays with nanometer gaps.

Main Results:

  • Successfully fabricated 3D nanostructures with embedded gold nanocrystals.
  • Achieved SERS enhancement factors of approximately 10⁴ for methyl violet.
  • Demonstrated reproducible SERS enhancement using silver-coated EBID dimer antennas.

Conclusions:

  • Silver coating activates EBID nanostructures for plasmonic applications.
  • EBID-fabricated dimer antennas provide a manufacturable SERS substrate.
  • Tunable silver layer thickness allows optimization of SERS substrate resonance.