Tunability of the surface plasmon resonance wavelength is demonstrated by varying the thickness of Al 2O 3 spacer layer inserted between the graphene and nanoparticles. By varying the spacer layer thickness from 0.3 to 1.8 nm, the resonance wavelength is shifted from 583 to 566 nm. The shift is due to a change in the electromagnetic field coupling strength between the localized surface plasmons excited in the gold nanoparticles and a single layer graphene film. In contrast, when the graphene film is absent from the system, no noticeable shift in the resonance wavelength is observed upon varying the spacer thickness.
Bibliographical noteFunding Information:
This work is supported by the Singapore National Research Foundation under CRP Award No. NRF-CRP 4-2008-06 and by the National Research Foundation of Korea (NRF) (2011-0006268).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)