Enhanced Raman scattering of graphene using arrays of split ring resonators

21.06.2013, 00:00

Newsletter 6

Graphene plasmonics, the combination of graphene with plasmonic nanostructures, has recently attracted great interest in research fields such as biochemical sensing, optical detectors and photovoltaics. We have recently demonstrated a novel and tunable platform consisting of graphene monolayers transferred on to arrays of nanometer-sized split ring resonators (SRRs) exhibiting resonances in the visible range. The system is suitable for high sensitivity biochemical detection based on surface-enhanced Raman scattering (SERS). SERS enhancements of up to 75-fold have been measured for graphene, confirming the existence of strong plasmonic coupling between graphene and the SRR resonances. Distinct resonances resulting in different SERS can be excited by the incident laser light, the photoluminescence signal emitted by the SRR arrays, and the Raman scattered light from graphene. This observation advances our basic understanding of the SERS mechanism and provides new experimental ways for engineering the Raman enhancement in such hybrid structures. More-over, our advanced SERS substrate is ideal for making controlled contact between the SRR near-field and the molecules to be detected, which would be attached to graphene in future near-field sensing devices.

Contact: george.sarau(at)mpl.mpg(dot)de
Group: Photonic Nanostructures (TDSU)
Reference: G. Sarau et al., Adv. Optical Mater. 1, 151-157 (2013).