Combined Antenna and Localized Plasmon Resonance in Raman Scattering from Random Arrays of Silver-Coated, Vertically Aligned Multiwalled Carbon Nanotubes

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, multiwalled ca...

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Veröffentlicht in:	Nano letters 2011-02, Vol.11 (2), p.365-371
Hauptverfasser:	Dawson, P, Duenas, J. A, Boyle, M. G, Doherty, M. D, Bell, S. E. J, Kern, A. M, Martin, O. J. F, Teh, A.-S, Teo, K. B. K, Milne, W. I
Format:	Artikel
Sprache:	eng
Schlagworte:	Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Crystallization - methods Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Equipment Design Equipment Failure Analysis Exact sciences and technology Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Macromolecular Substances - chemistry Materials science Materials Testing Molecular Conformation Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanotechnology - instrumentation Nanotubes Nanotubes, Carbon - chemistry Nanotubes, Carbon - ultrastructure Particle Size Physics Silver - chemistry Surface and interface electron states Surface Plasmon Resonance - instrumentation Surface Properties Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Zusammenfassung:	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, multiwalled 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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl102838w