Combined antenna and localized plasmon resonance in Raman scattering from Random arrays of silver-coated, vertically aligned multiwalled carbon nanotubes

Paul Dawson, J.A. Duenas, Michael Boyle, Matthew Doherty, S. E. J. Bell, A. M. Kern, O. F. J. Martin, A. S. Teh, K. B. K. Teo, W. I. Milne

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Abstract

The electric field enhancement associated with detailed structure within novel optical antenna nanostructures is modeled using the surface integral equation technique in the context of surface-enhanced Raman scattering (SERS). The antennae comprise random arrays of vertically aligned, multi-walled carbon nanotubes dressed with highly granular Ag. Different types of "hot-spot" underpinning the SERS are identified, but contrasting characteristics are revealed. Those at the outer edges of the Ag grains are antenna driven with field enhancement amplified in antenna antinodes while intergrain hotspots are largely independent of antenna activity. Hot-spots between the tops of antennae leaning towards each other also appear to benefit from antenna amplification.
Original languageEnglish
Pages (from-to)365-371
Number of pages7
JournalNano Letters
Volume11
Issue number2
Early online date25 Jan 2011
DOIs
Publication statusPublished - 09 Feb 2011

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

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    Dawson, P., Duenas, J. A., Boyle, M., Doherty, M., Bell, S. E. J., Kern, A. M., Martin, O. F. J., Teh, A. S., Teo, K. B. K., & Milne, W. I. (2011). Combined antenna and localized plasmon resonance in Raman scattering from Random arrays of silver-coated, vertically aligned multiwalled carbon nanotubes. Nano Letters, 11(2), 365-371. https://doi.org/10.1021/nl102838w