Journal
FARADAY DISCUSSIONS
Volume 178, Issue -, Pages 185-193Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4fd00195h
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Funding
- EPSRC [EP/G060649/1, EP/I012060/1]
- ERC [LINASS 320503]
- Queens' College
- Winton Programme for the Physics of Sustainability
- EPSRC [EP/H027130/1, EP/H007024/1, EP/E040241/1, EP/L027151/1, EP/G060649/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H027130/1, EP/H007024/1, EP/E040241/1, EP/L027151/1, EP/G060649/1, 1352498] Funding Source: researchfish
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Plasmonic coupling of gold nanoparticles to a gold surface creates intense plasmonic hot spots with large electromagnetic field-enhancements within the cavity formed by the two metallic surfaces. The localised field in such structures is extremely sensitive to morphological fluctuations and subtle changes in the dielectric properties of the cavity contents. Here, we present an optical method that pins down the properties of the gap contents with high sensitivity, termed normalising plasmon resonance (NPR) spectroscopy. We use this on a variety of ultrathin molecular spacers such as filled and empty cucurbiturils, and graphene. Clear differences in the spectral positions and intensities of plasmonic modes observed in the scattering spectrum resolve thickness differences of 0.1 nm, and refractive index changes from molecular filling.
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