Abstract
Shifting of the surface plasmon resonance wavelength induced by the variation of the thickness of insulating spacer between single layer graphene and Au nanoparticles is studied. The system demonstrates a blue-shift of 29 nm as the thickness of the spacer layer increases from 0 to 15 nm. This is due to the electromagnetic coupling between the localized surface plasmons excited in the nanoparticles and the graphene film. The strength of the coupling decays exponentially with a decay length of d/R = 0.36, where d is the spacer layer thickness and R is the diameter of the Au nanoparticles. The result agrees qualitatively well with the plasmon ruler equation. Interestingly, a further increment of the spacer layer thickness induces a red-shift of 17 nm in the resonance wavelength and the shift saturates when the thickness of the spacer layer increases above 20 nm.
Original language | English |
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Pages (from-to) | 19690-19696 |
Number of pages | 7 |
Journal | Optics Express |
Volume | 20 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2012 Aug 27 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics