Shifting of surface plasmon resonance due to electromagnetic coupling between graphene and Au nanoparticles

Jing Niu, Young Jun Shin, Jaesung Son, Youngbin Lee, Jong Hyun Ahn, Hyunsoo Yang

Research output: Contribution to journalArticle

34 Citations (Scopus)

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 languageEnglish
Pages (from-to)19690-19696
Number of pages7
JournalOptics Express
Volume20
Issue number18
DOIs
Publication statusPublished - 2012 Aug 27

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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