Abstract
The refractive index sensing properties of plasmonic resonances in gold nanoparticles (nanorods and nanobipyramids) are investigated through numerical simulations. We find that the quadruple resonance in both nanoparticles shows much higher sensing figure of merit (FOM) than its dipolar counterpart, which is attributed mainly to the reduction in resonance linewidth. More importantly, our results predict that at the same sensing wavelength, the sensing FOM of the quadrupole mode can be significantly boosted from 3.9 for gold nanorods to 7.4 for gold nanobipyramids due to the geometry-dependent resonance linewidth, revealing a useful strategy for optimizing the sensing performance of metal nanoparticles.
| Original language | English |
|---|---|
| Article number | 187 |
| Journal | Nanoscale Research Letters |
| Volume | 9 |
| Online published | 22 Apr 2014 |
| DOIs | |
| Publication status | Published - 2014 |
| Externally published | Yes |
Research Keywords
- Gold nanoparticles
- Localized surface plasmon resonance
- Refractive index sensing
Publisher's Copyright Statement
- This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
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