Journal
NANO LETTERS
Volume 13, Issue 1, Pages 301-308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3041542
Keywords
Raman spectroscopy; enhancement; plasmonic cavity; suspended graphene; strain
Categories
Funding
- German Research Foundation (DFG) [SFB 658]
- ERC [210642]
- NanoScale Focus Area
- Leverhulme Trust (U.K.)
- U.K. Engineering and Physical Sciences Research Council (EPSRC)
- Engineering and Physical Science Research Council (EPSRC) U.K. [EP/G035954/1]
- German Research Foundation (DFG via EraNet, Nanospec) [566322]
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/H006400/1, EP/D063329/1, EP/K016946/1] Funding Source: researchfish
- EPSRC [EP/D063329/1, EP/H000917/2, EP/K016946/1, EP/H006400/1] Funding Source: UKRI
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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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