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|Title:||Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles|
|Citation:||Niu, J., Shin, Y.J., Son, J., Lee, Y., Ahn, J.-H., Yang, H. (2012-08-27). Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles. Optics Express 20 (18) : 19690-19696. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.20.019690|
|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. © 2012 Optical Society of America.|
|Source Title:||Optics Express|
|Appears in Collections:||Staff Publications|
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