期刊
NANO LETTERS
卷 11, 期 2, 页码 365-371出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl102838w
关键词
Surface-enhanced Raman scattering; optical antenna; plasmons; surface integral equation; carbon nanotubes
类别
资金
- EC [STRP 505626-1]
- Nanotec NI
- Invest Northern Ireland
- Swiss National Science Foundation [20021-116758]
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.
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