Polarized Plasmonic Enhancement by Au Nanostructures Probed through Raman Scattering of Suspended Graphene
Nano Letters2012Vol. 13(1), pp. 301–308
Citations Over TimeTop 10% of 2012 papers
Sebastian Heeg, Roberto Fernández‐García, Antonios Oikonomou, F. Schedin, Rohit Narula, Stefan A. Maier, Aravind Vijayaraghavan, Stephanie Reich
Abstract
We characterize plasmonic enhancement in a hotspot between two Au nanodisks using Raman scattering of graphene. Single layer graphene is suspended across the dimer cavity and provides an ideal two-dimensional test material for the local near-field distribution. We detect a Raman enhancement of the order of 10(3) originating from the cavity. Spatially resolved Raman measurements reveal a near-field localization one order of magnitude smaller than the wavelength of the excitation, which can be turned off by rotating the polarization of the excitation. The suspended graphene is under tensile strain. The resulting phonon mode softening allows for a clear identification of the enhanced signal compared to unperturbed graphene.
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