期刊
NANO LETTERS
卷 8, 期 11, 页码 3893-3898出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl8023142
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资金
- Swedish Research Council
- Swedish Foundation for Strategic Research
We present a straightforward method to double the refractive index sensitivity of surf ace-supported nanoplasmonic optical sensors by lifting the metal nanoparticles above the substrate by a dielectric nanopillar. The role of the pillar is to substantially decrease the spatial overlap between the substrate and the enhanced fields generated at plasmon resonance. Data presented for nanodisks and nanoellipsoids supported by pillars of varying heights are found to be in excellent agreement with electrodynamics simulations. The described concepts apply to multitude of plasmonic nanostructures, fabricated by top-down or bottom-up techniques, and are likely to further facilitate the development of novel nanooptical sensors for biomedicine and diagnostics.
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